diff --git a/pkg/tree.go b/pkg/tree.go
new file mode 100644
index 0000000..aaf13be
--- /dev/null
+++ b/pkg/tree.go
@@ -0,0 +1,27 @@
+package pkg
+
+type Node[T any] struct {
+	Data     T
+	Children []Node[T]
+}
+
+// 适用 A00001B00001 层级结构
+// parent 父级字符串
+// length A00001 一个节点长度
+// pathFunc 返回T的code A00001
+func Tree[T any](data []T, parent string, length int, pathFunc func(d T) string) (res []Node[T]) {
+	for _, v := range data {
+		path := pathFunc(v)
+		if len(path) < length {
+			return nil
+		}
+		p := path[:len(path)-length]
+		if p == parent {
+			res = append(res, Node[T]{
+				Data:     v,
+				Children: Tree[T](data, path, length, pathFunc),
+			})
+		}
+	}
+	return
+}