diff --git a/.gitmodules b/.gitmodules
index 17e1be420..fd65dc85a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -22,3 +22,18 @@
 [submodule "plugins/emqttd_plugin_redis"]
 	path = plugins/emqttd_plugin_redis
 	url = https://github.com/emqtt/emqttd_plugin_redis.git
+[submodule "plugins/emqplus_backend_redis"]
+	path = plugins/emqplus_backend_redis
+	url = git@github.com:emqplus/emqplus_backend_redis.git
+[submodule "plugins/emqplus_backend_mongo"]
+	path = plugins/emqplus_backend_mongo
+	url = git@github.com:emqplus/emqplus_backend_mongo.git
+[submodule "plugins/emqplus_backend_mysql"]
+	path = plugins/emqplus_backend_mysql
+	url = git@github.com:emqplus/emqplus_backend_mysql.git
+[submodule "plugins/emqplus_backend_pgsql"]
+	path = plugins/emqplus_backend_pgsql
+	url = git@github.com:emqplus/emqplus_backend_pgsql.git
+[submodule "plugins/emqplus_backend_cassa"]
+	path = plugins/emqplus_backend_cassa
+	url = git@github.com:emqplus/emqplus_backend_cassa.git
diff --git a/plugins/emqplus_backend_cassa b/plugins/emqplus_backend_cassa
new file mode 160000
index 000000000..62c52536a
--- /dev/null
+++ b/plugins/emqplus_backend_cassa
@@ -0,0 +1 @@
+Subproject commit 62c52536a4263fa2735478420b8e78b8f494be2a
diff --git a/plugins/emqplus_backend_mongo b/plugins/emqplus_backend_mongo
new file mode 160000
index 000000000..8a7b5cc03
--- /dev/null
+++ b/plugins/emqplus_backend_mongo
@@ -0,0 +1 @@
+Subproject commit 8a7b5cc03f1e55cfd6d50ed1a7161ecd8a4a14be
diff --git a/plugins/emqplus_backend_mysql b/plugins/emqplus_backend_mysql
new file mode 160000
index 000000000..c7bebfe62
--- /dev/null
+++ b/plugins/emqplus_backend_mysql
@@ -0,0 +1 @@
+Subproject commit c7bebfe62a208284cb38cab89f2fd6d73968aa33
diff --git a/plugins/emqplus_backend_pgsql b/plugins/emqplus_backend_pgsql
new file mode 160000
index 000000000..92825dea5
--- /dev/null
+++ b/plugins/emqplus_backend_pgsql
@@ -0,0 +1 @@
+Subproject commit 92825dea51e3debf68a2387e66bae27d375975f8
diff --git a/plugins/emqplus_backend_redis b/plugins/emqplus_backend_redis
new file mode 160000
index 000000000..4e9c1a234
--- /dev/null
+++ b/plugins/emqplus_backend_redis
@@ -0,0 +1 @@
+Subproject commit 4e9c1a234d35561c6227f0e6ff98a612fab50ec4