diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..7be3f48
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,9 @@
+[submodule "intro"]
+	path = intro
+	url = https://git.hmtsai.cn/study-area-cn/intro
+[submodule "learn-computer-basic"]
+	path = learn-computer-basic
+	url = https://git.hmtsai.cn/study-area-cn/learn-computer-basic
+[submodule "learn-linux-basic"]
+	path = learn-linux-basic
+	url = https://git.hmtsai.cn/study-area-cn/learn-linux-basic
diff --git a/intro b/intro
new file mode 160000
index 0000000..7f9cdce
--- /dev/null
+++ b/intro
@@ -0,0 +1 @@
+Subproject commit 7f9cdce134405a576fe96cc3af6bec369f56346f
diff --git a/learn-computer-basic b/learn-computer-basic
new file mode 160000
index 0000000..e575374
--- /dev/null
+++ b/learn-computer-basic
@@ -0,0 +1 @@
+Subproject commit e5753748b74e20de3e875a50184ca3c6f0f929d5
diff --git a/learn-linux-basic b/learn-linux-basic
new file mode 160000
index 0000000..5add39d
--- /dev/null
+++ b/learn-linux-basic
@@ -0,0 +1 @@
+Subproject commit 5add39d494ed12e59b8f6bbf48c1605faad32bf9