diff --git a/packages/README.md b/packages/README.md
new file mode 100644
index 0000000..96a46fd
--- /dev/null
+++ b/packages/README.md
@@ -0,0 +1,5 @@
+# test readme in packages
+
+...
+
+
diff --git a/packages/aa/aa.go b/packages/aa/aa.go
new file mode 100644
index 0000000..6627c4f
--- /dev/null
+++ b/packages/aa/aa.go
@@ -0,0 +1,5 @@
+package aa
+
+func AA(x, y int) int {
+	return x + y + 1
+}
diff --git a/packages/bb.go b/packages/bb.go
new file mode 100644
index 0000000..24c3747
--- /dev/null
+++ b/packages/bb.go
@@ -0,0 +1,5 @@
+package go_subdir
+
+func BB(x, y int) int {
+	return x + y + 4
+}
diff --git a/packages/go.mod b/packages/go.mod
new file mode 100644
index 0000000..23f6054
--- /dev/null
+++ b/packages/go.mod
@@ -0,0 +1,3 @@
+module www.zhao1012112796.top/testg/go_subdir
+
+go 1.25.0