diff --git a/go.mod b/go.mod
index 7d6c86f2b..9ef1caa6b 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,4 @@
-module github.com/bilibili/Kratos
+module github.com/bilibili/kratos
 
 require (
 	github.com/BurntSushi/toml v0.3.1
@@ -19,3 +19,5 @@ require (
 	gopkg.in/go-playground/assert.v1 v1.2.1 // indirect
 	gopkg.in/go-playground/validator.v9 v9.26.0
 )
+
+go 1.12
diff --git a/pkg/conf/dsn/dsn_test.go b/pkg/conf/dsn/dsn_test.go
index 815ead818..01573be51 100644
--- a/pkg/conf/dsn/dsn_test.go
+++ b/pkg/conf/dsn/dsn_test.go
@@ -6,7 +6,7 @@ import (
 	"testing"
 	"time"
 
-	xtime "github.com/bilibili/Kratos/pkg/time"
+	xtime "github.com/bilibili/kratos/pkg/time"
 )
 
 type config struct {
diff --git a/pkg/conf/dsn/example_test.go b/pkg/conf/dsn/example_test.go
index ed81e4204..51d075d96 100644
--- a/pkg/conf/dsn/example_test.go
+++ b/pkg/conf/dsn/example_test.go
@@ -3,8 +3,8 @@ package dsn_test
 import (
 	"log"
 
-	"github.com/bilibili/Kratos/pkg/conf/dsn"
-	xtime "github.com/bilibili/Kratos/pkg/time"
+	"github.com/bilibili/kratos/pkg/conf/dsn"
+	xtime "github.com/bilibili/kratos/pkg/time"
 )
 
 // Config struct
diff --git a/pkg/conf/dsn/query_test.go b/pkg/conf/dsn/query_test.go
index 0f7ea15c1..3bac1f9eb 100644
--- a/pkg/conf/dsn/query_test.go
+++ b/pkg/conf/dsn/query_test.go
@@ -6,7 +6,7 @@ import (
 	"testing"
 	"time"
 
-	xtime "github.com/bilibili/Kratos/pkg/time"
+	xtime "github.com/bilibili/kratos/pkg/time"
 )
 
 type cfg1 struct {
@@ -66,7 +66,7 @@ func TestDecodeQuery(t *testing.T) {
 			},
 		},
 		{
-			name: "test github.com/bilibili/Kratos/pkg/time",
+			name: "test github.com/bilibili/kratos/pkg/time",
 			args: args{
 				query: url.Values{
 					"timeout": {"1s"},
@@ -77,7 +77,7 @@ func TestDecodeQuery(t *testing.T) {
 			cfg:  &cfg2{xtime.Duration(time.Second)},
 		},
 		{
-			name: "test empty github.com/bilibili/Kratos/pkg/time",
+			name: "test empty github.com/bilibili/kratos/pkg/time",
 			args: args{
 				query: url.Values{},
 				v:     &cfg2{},
@@ -86,7 +86,7 @@ func TestDecodeQuery(t *testing.T) {
 			cfg:  &cfg2{},
 		},
 		{
-			name: "test github.com/bilibili/Kratos/pkg/time",
+			name: "test github.com/bilibili/kratos/pkg/time",
 			args: args{
 				query: url.Values{},
 				v:     &cfg4{},
diff --git a/pkg/conf/paladin/default.go b/pkg/conf/paladin/default.go
index bd7dfb88a..498ca919a 100644
--- a/pkg/conf/paladin/default.go
+++ b/pkg/conf/paladin/default.go
@@ -4,7 +4,7 @@ import (
 	"context"
 	"flag"
 
-	"github.com/bilibili/Kratos/pkg/log"
+	"github.com/bilibili/kratos/pkg/log"
 )
 
 var (
diff --git a/pkg/conf/paladin/example_test.go b/pkg/conf/paladin/example_test.go
index 3969bf505..d3d365457 100644
--- a/pkg/conf/paladin/example_test.go
+++ b/pkg/conf/paladin/example_test.go
@@ -4,7 +4,7 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/bilibili/Kratos/pkg/conf/paladin"
+	"github.com/bilibili/kratos/pkg/conf/paladin"
 
 	"github.com/BurntSushi/toml"
 )
diff --git a/pkg/conf/paladin/map_test.go b/pkg/conf/paladin/map_test.go
index 6d98ea8a7..99bef1990 100644
--- a/pkg/conf/paladin/map_test.go
+++ b/pkg/conf/paladin/map_test.go
@@ -3,7 +3,7 @@ package paladin_test
 import (
 	"testing"
 
-	"github.com/bilibili/Kratos/pkg/conf/paladin"
+	"github.com/bilibili/kratos/pkg/conf/paladin"
 
 	"github.com/BurntSushi/toml"
 	"github.com/stretchr/testify/assert"
diff --git a/pkg/conf/paladin/mock_test.go b/pkg/conf/paladin/mock_test.go
index 0d088ed2c..7181d4dc7 100644
--- a/pkg/conf/paladin/mock_test.go
+++ b/pkg/conf/paladin/mock_test.go
@@ -3,7 +3,7 @@ package paladin_test
 import (
 	"testing"
 
-	"github.com/bilibili/Kratos/pkg/conf/paladin"
+	"github.com/bilibili/kratos/pkg/conf/paladin"
 
 	"github.com/stretchr/testify/assert"
 )
diff --git a/pkg/container/pool/list_test.go b/pkg/container/pool/list_test.go
index 421e22771..2c9091591 100644
--- a/pkg/container/pool/list_test.go
+++ b/pkg/container/pool/list_test.go
@@ -6,7 +6,7 @@ import (
 	"testing"
 	"time"
 
-	xtime "github.com/bilibili/Kratos/pkg/time"
+	xtime "github.com/bilibili/kratos/pkg/time"
 
 	"github.com/stretchr/testify/assert"
 )
diff --git a/pkg/container/pool/pool.go b/pkg/container/pool/pool.go
index 13ad43e6f..7e273241e 100644
--- a/pkg/container/pool/pool.go
+++ b/pkg/container/pool/pool.go
@@ -6,7 +6,7 @@ import (
 	"io"
 	"time"
 
-	xtime "github.com/bilibili/Kratos/pkg/time"
+	xtime "github.com/bilibili/kratos/pkg/time"
 )
 
 var (
diff --git a/pkg/container/pool/slice_test.go b/pkg/container/pool/slice_test.go
index 4fa19930d..104d20ff5 100644
--- a/pkg/container/pool/slice_test.go
+++ b/pkg/container/pool/slice_test.go
@@ -6,7 +6,7 @@ import (
 	"testing"
 	"time"
 
-	xtime "github.com/bilibili/Kratos/pkg/time"
+	xtime "github.com/bilibili/kratos/pkg/time"
 
 	"github.com/stretchr/testify/assert"
 )
diff --git a/pkg/container/queue/aqm/codel.go b/pkg/container/queue/aqm/codel.go
index 4f0866251..df32fade0 100644
--- a/pkg/container/queue/aqm/codel.go
+++ b/pkg/container/queue/aqm/codel.go
@@ -6,7 +6,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/bilibili/Kratos/pkg/ecode"
+	"github.com/bilibili/kratos/pkg/ecode"
 )
 
 // Config codel config.
diff --git a/pkg/container/queue/aqm/codel_test.go b/pkg/container/queue/aqm/codel_test.go
index 5857108a3..1edef0f70 100644
--- a/pkg/container/queue/aqm/codel_test.go
+++ b/pkg/container/queue/aqm/codel_test.go
@@ -8,7 +8,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/bilibili/Kratos/pkg/ecode"
+	"github.com/bilibili/kratos/pkg/ecode"
 )
 
 var testConf = &Config{
diff --git a/pkg/log/field.go b/pkg/log/field.go
index fe2609b95..144af2fd3 100644
--- a/pkg/log/field.go
+++ b/pkg/log/field.go
@@ -4,7 +4,7 @@ import (
 	"math"
 	"time"
 
-	"github.com/bilibili/Kratos/pkg/log/internal/core"
+	"github.com/bilibili/kratos/pkg/log/internal/core"
 )
 
 // D represents a map of entry level data used for structured logging.
diff --git a/pkg/log/file.go b/pkg/log/file.go
index fd08caebd..3fcc906e9 100644
--- a/pkg/log/file.go
+++ b/pkg/log/file.go
@@ -6,7 +6,7 @@ import (
 	"path/filepath"
 	"time"
 
-	"github.com/bilibili/Kratos/pkg/log/internal/filewriter"
+	"github.com/bilibili/kratos/pkg/log/internal/filewriter"
 )
 
 // level idx
diff --git a/pkg/log/internal/core/field.go b/pkg/log/internal/core/field.go
index 7c7e30ca8..99c78325b 100644
--- a/pkg/log/internal/core/field.go
+++ b/pkg/log/internal/core/field.go
@@ -5,7 +5,7 @@ import (
 	"math"
 	"time"
 
-	xtime "github.com/bilibili/Kratos/pkg/time"
+	xtime "github.com/bilibili/kratos/pkg/time"
 )
 
 // FieldType represent D value type
diff --git a/pkg/log/log.go b/pkg/log/log.go
index 1c3e4c283..d26f58f38 100644
--- a/pkg/log/log.go
+++ b/pkg/log/log.go
@@ -8,7 +8,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/bilibili/Kratos/pkg/conf/env"
+	"github.com/bilibili/kratos/pkg/conf/env"
 )
 
 // Config log config.
diff --git a/pkg/log/log_test.go b/pkg/log/log_test.go
index 4b15c1b7e..2933d42f2 100644
--- a/pkg/log/log_test.go
+++ b/pkg/log/log_test.go
@@ -4,7 +4,7 @@ import (
 	"context"
 	"testing"
 
-	"github.com/bilibili/Kratos/pkg/net/metadata"
+	"github.com/bilibili/kratos/pkg/net/metadata"
 
 	"github.com/stretchr/testify/assert"
 )
diff --git a/pkg/log/util.go b/pkg/log/util.go
index 648664b0a..3f9ef10eb 100644
--- a/pkg/log/util.go
+++ b/pkg/log/util.go
@@ -6,9 +6,9 @@ import (
 	"runtime"
 	"strconv"
 
-	"github.com/bilibili/Kratos/pkg/conf/env"
-	"github.com/bilibili/Kratos/pkg/net/metadata"
-	"github.com/bilibili/Kratos/pkg/net/trace"
+	"github.com/bilibili/kratos/pkg/conf/env"
+	"github.com/bilibili/kratos/pkg/net/metadata"
+	"github.com/bilibili/kratos/pkg/net/trace"
 )
 
 func addExtraField(ctx context.Context, fields map[string]interface{}) {
diff --git a/pkg/naming/discovery/discovery.go b/pkg/naming/discovery/discovery.go
index a773ac3cb..3548e7fca 100644
--- a/pkg/naming/discovery/discovery.go
+++ b/pkg/naming/discovery/discovery.go
@@ -14,15 +14,15 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/bilibili/Kratos/pkg/conf/env"
-	"github.com/bilibili/Kratos/pkg/ecode"
-	"github.com/bilibili/Kratos/pkg/log"
-	"github.com/bilibili/Kratos/pkg/naming"
-	bm "github.com/bilibili/Kratos/pkg/net/http/blademaster"
-	"github.com/bilibili/Kratos/pkg/net/netutil"
-	"github.com/bilibili/Kratos/pkg/net/netutil/breaker"
-	xstr "github.com/bilibili/Kratos/pkg/str"
-	xtime "github.com/bilibili/Kratos/pkg/time"
+	"github.com/bilibili/kratos/pkg/conf/env"
+	"github.com/bilibili/kratos/pkg/ecode"
+	"github.com/bilibili/kratos/pkg/log"
+	"github.com/bilibili/kratos/pkg/naming"
+	bm "github.com/bilibili/kratos/pkg/net/http/blademaster"
+	"github.com/bilibili/kratos/pkg/net/netutil"
+	"github.com/bilibili/kratos/pkg/net/netutil/breaker"
+	xstr "github.com/bilibili/kratos/pkg/str"
+	xtime "github.com/bilibili/kratos/pkg/time"
 )
 
 const (
diff --git a/pkg/net/http/blademaster/client.go b/pkg/net/http/blademaster/client.go
index eacdaa5f9..86fc45f84 100644
--- a/pkg/net/http/blademaster/client.go
+++ b/pkg/net/http/blademaster/client.go
@@ -17,11 +17,11 @@ import (
 	"sync"
 	"time"
 
-	"github.com/bilibili/Kratos/pkg/conf/env"
-	"github.com/bilibili/Kratos/pkg/net/metadata"
-	"github.com/bilibili/Kratos/pkg/net/netutil/breaker"
-	"github.com/bilibili/Kratos/pkg/stat"
-	xtime "github.com/bilibili/Kratos/pkg/time"
+	"github.com/bilibili/kratos/pkg/conf/env"
+	"github.com/bilibili/kratos/pkg/net/metadata"
+	"github.com/bilibili/kratos/pkg/net/netutil/breaker"
+	"github.com/bilibili/kratos/pkg/stat"
+	xtime "github.com/bilibili/kratos/pkg/time"
 
 	"github.com/gogo/protobuf/proto"
 	pkgerr "github.com/pkg/errors"
diff --git a/pkg/net/http/blademaster/metadata.go b/pkg/net/http/blademaster/metadata.go
index a868f4305..da62512ef 100644
--- a/pkg/net/http/blademaster/metadata.go
+++ b/pkg/net/http/blademaster/metadata.go
@@ -6,8 +6,8 @@ import (
 	"strings"
 	"time"
 
-	"github.com/bilibili/Kratos/pkg/conf/env"
-	"github.com/bilibili/Kratos/pkg/log"
+	"github.com/bilibili/kratos/pkg/conf/env"
+	"github.com/bilibili/kratos/pkg/log"
 
 	"github.com/pkg/errors"
 )
diff --git a/pkg/net/http/blademaster/trace.go b/pkg/net/http/blademaster/trace.go
index b792246bb..2200ac982 100644
--- a/pkg/net/http/blademaster/trace.go
+++ b/pkg/net/http/blademaster/trace.go
@@ -5,7 +5,7 @@ import (
 	"net/http"
 	"net/http/httptrace"
 
-	"github.com/bilibili/Kratos/pkg/net/trace"
+	"github.com/bilibili/kratos/pkg/net/trace"
 )
 
 const _defaultComponentName = "net/http"
diff --git a/pkg/net/netutil/breaker/breaker.go b/pkg/net/netutil/breaker/breaker.go
index 6fe45e7e6..f7b681ac3 100644
--- a/pkg/net/netutil/breaker/breaker.go
+++ b/pkg/net/netutil/breaker/breaker.go
@@ -4,7 +4,7 @@ import (
 	"sync"
 	"time"
 
-	xtime "github.com/bilibili/Kratos/pkg/time"
+	xtime "github.com/bilibili/kratos/pkg/time"
 )
 
 // Config broker config.
diff --git a/pkg/net/netutil/breaker/sre_breaker.go b/pkg/net/netutil/breaker/sre_breaker.go
index d713dfe4f..d175d0b2e 100644
--- a/pkg/net/netutil/breaker/sre_breaker.go
+++ b/pkg/net/netutil/breaker/sre_breaker.go
@@ -6,9 +6,9 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/bilibili/Kratos/pkg/ecode"
-	"github.com/bilibili/Kratos/pkg/log"
-	"github.com/bilibili/Kratos/pkg/stat/summary"
+	"github.com/bilibili/kratos/pkg/ecode"
+	"github.com/bilibili/kratos/pkg/log"
+	"github.com/bilibili/kratos/pkg/stat/summary"
 )
 
 // sreBreaker is a sre CircuitBreaker pattern.
diff --git a/pkg/net/trace/config.go b/pkg/net/trace/config.go
index d6f918acd..c43e09e71 100644
--- a/pkg/net/trace/config.go
+++ b/pkg/net/trace/config.go
@@ -8,9 +8,9 @@ import (
 
 	"github.com/pkg/errors"
 
-	"github.com/bilibili/Kratos/pkg/conf/dsn"
-	"github.com/bilibili/Kratos/pkg/conf/env"
-	xtime "github.com/bilibili/Kratos/pkg/time"
+	"github.com/bilibili/kratos/pkg/conf/dsn"
+	"github.com/bilibili/kratos/pkg/conf/env"
+	xtime "github.com/bilibili/kratos/pkg/time"
 )
 
 var _traceDSN = "unixgram:///var/run/dapper-collect/dapper-collect.sock"
diff --git a/pkg/net/trace/marshal.go b/pkg/net/trace/marshal.go
index 414dfb59c..6324694e0 100644
--- a/pkg/net/trace/marshal.go
+++ b/pkg/net/trace/marshal.go
@@ -11,7 +11,7 @@ import (
 	"github.com/golang/protobuf/ptypes/duration"
 	"github.com/golang/protobuf/ptypes/timestamp"
 
-	protogen "github.com/bilibili/Kratos/pkg/net/trace/proto"
+	protogen "github.com/bilibili/kratos/pkg/net/trace/proto"
 )
 
 const protoVersion1 int32 = 1
diff --git a/pkg/net/trace/span.go b/pkg/net/trace/span.go
index 1cd2eb101..6d852213b 100644
--- a/pkg/net/trace/span.go
+++ b/pkg/net/trace/span.go
@@ -4,7 +4,7 @@ import (
 	"fmt"
 	"time"
 
-	protogen "github.com/bilibili/Kratos/pkg/net/trace/proto"
+	protogen "github.com/bilibili/kratos/pkg/net/trace/proto"
 )
 
 const (
diff --git a/pkg/net/trace/util.go b/pkg/net/trace/util.go
index 8345e4c54..216f9bccc 100644
--- a/pkg/net/trace/util.go
+++ b/pkg/net/trace/util.go
@@ -6,9 +6,9 @@ import (
 	"math/rand"
 	"time"
 
-	"github.com/bilibili/Kratos/pkg/conf/env"
-	"github.com/bilibili/Kratos/pkg/net/ip"
-	"github.com/bilibili/Kratos/pkg/net/metadata"
+	"github.com/bilibili/kratos/pkg/conf/env"
+	"github.com/bilibili/kratos/pkg/net/ip"
+	"github.com/bilibili/kratos/pkg/net/metadata"
 
 	"github.com/pkg/errors"
 )
@@ -45,7 +45,7 @@ type stackTracer interface {
 
 type ctxKey string
 
-var _ctxkey ctxKey = "Kratos/pkg/net/trace.trace"
+var _ctxkey ctxKey = "kratos/pkg/net/trace.trace"
 
 // FromContext returns the trace bound to the context, if any.
 func FromContext(ctx context.Context) (t Trace, ok bool) {
diff --git a/pkg/stat/stat.go b/pkg/stat/stat.go
index 7f8c98fb7..7d9c6343b 100644
--- a/pkg/stat/stat.go
+++ b/pkg/stat/stat.go
@@ -1,7 +1,7 @@
 package stat
 
 import (
-	"github.com/bilibili/Kratos/pkg/stat/prom"
+	"github.com/bilibili/kratos/pkg/stat/prom"
 )
 
 // Stat interface.
diff --git a/tool/kratos/template.go b/tool/kratos/template.go
index 781d4ed76..a31d2c725 100644
--- a/tool/kratos/template.go
+++ b/tool/kratos/template.go
@@ -75,8 +75,8 @@ import (
 	"{{.Name}}/internal/server/grpc"
 	"{{.Name}}/internal/server/http"
 	"{{.Name}}/internal/service"
-	"github.com/bilibili/Kratos/pkg/conf/paladin"
-	"github.com/bilibili/Kratos/pkg/log"
+	"github.com/bilibili/kratos/pkg/conf/paladin"
+	"github.com/bilibili/kratos/pkg/log"
 )
 
 func main() {
@@ -126,12 +126,12 @@ import (
 	"context"
 	"time"
 
-	"github.com/bilibili/Kratos/pkg/cache/memcache"
-	"github.com/bilibili/Kratos/pkg/cache/redis"
-	"github.com/bilibili/Kratos/pkg/conf/paladin"
-	"github.com/bilibili/Kratos/pkg/database/sql"
-	"github.com/bilibili/Kratos/pkg/log"
-	xtime "github.com/bilibili/Kratos/pkg/time"
+	"github.com/bilibili/kratos/pkg/cache/memcache"
+	"github.com/bilibili/kratos/pkg/cache/redis"
+	"github.com/bilibili/kratos/pkg/conf/paladin"
+	"github.com/bilibili/kratos/pkg/database/sql"
+	"github.com/bilibili/kratos/pkg/log"
+	xtime "github.com/bilibili/kratos/pkg/time"
 )
 
 // Dao dao.
@@ -233,7 +233,7 @@ import (
 	"context"
 
 	"{{.Name}}/internal/dao"
-	"github.com/bilibili/Kratos/pkg/conf/paladin"
+	"github.com/bilibili/kratos/pkg/conf/paladin"
 )
 
 // Service service.
@@ -274,7 +274,7 @@ import (
 
 	pb "{{.Name}}/api"
 	"{{.Name}}/internal/dao"
-	"github.com/bilibili/Kratos/pkg/conf/paladin"
+	"github.com/bilibili/kratos/pkg/conf/paladin"
 
 	"github.com/golang/protobuf/ptypes/empty"
 )
@@ -321,10 +321,10 @@ import (
 	"net/http"
 
 	"{{.Name}}/internal/service"
-	"github.com/bilibili/Kratos/pkg/conf/paladin"
-	"github.com/bilibili/Kratos/pkg/log"
-	bm "github.com/bilibili/Kratos/pkg/net/http/blademaster"
-	"github.com/bilibili/Kratos/pkg/net/http/blademaster/middleware/verify"
+	"github.com/bilibili/kratos/pkg/conf/paladin"
+	"github.com/bilibili/kratos/pkg/log"
+	bm "github.com/bilibili/kratos/pkg/net/http/blademaster"
+	"github.com/bilibili/kratos/pkg/net/http/blademaster/middleware/verify"
 )
 
 var (
@@ -425,8 +425,8 @@ message HelloReq {
 import (
 	pb "{{.Name}}/api"
 	"{{.Name}}/internal/service"
-	"github.com/bilibili/Kratos/pkg/conf/paladin"
-	"github.com/bilibili/Kratos/pkg/net/rpc/warden"
+	"github.com/bilibili/kratos/pkg/conf/paladin"
+	"github.com/bilibili/kratos/pkg/net/rpc/warden"
 )
 
 // New new a grpc server.
diff --git a/tool/kratos/tool_index.go b/tool/kratos/tool_index.go
index f420fd3d1..7de142492 100644
--- a/tool/kratos/tool_index.go
+++ b/tool/kratos/tool_index.go
@@ -6,7 +6,7 @@ var toolIndexs = []*Tool{
 	&Tool{
 		Name:      "kratos",
 		BuildTime: time.Date(2019, 4, 2, 0, 0, 0, 0, time.Local),
-		Install:   "go get -u github.com/bilibili/Kratos/tool/kratos",
+		Install:   "go get -u github.com/bilibili/kratos/tool/kratos",
 		Summary:   "Kratos工具集本体",
 		Platform:  []string{"darwin", "linux", "windows"},
 		Author:    "kratos",