diff --git a/.gitmodules b/.gitmodules
index 6d137be..b7e4a3b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -56,3 +56,6 @@
 [submodule "thingsboard"]
 	path = thingsboard
 	url = http://221.226.114.142:13000/THENG/thingsboard.git
+[submodule "hyf-backend"]
+	path = hyf-backend
+	url = http://th.local.t-aaron.com:13000/THENG/hyf-backend.git
diff --git a/hyf-backend b/hyf-backend
new file mode 160000
index 0000000..9246d62
--- /dev/null
+++ b/hyf-backend
@@ -0,0 +1 @@
+Subproject commit 9246d62cfa2382ddf478f581601184a3f99880c3