diff --git a/.gitmodules b/.gitmodules
index 5bbcab9f..deee553d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -16,3 +16,6 @@
 [submodule "test"]
 	path = test
 	url = git@github.com:blockchain-jd-com/jdchain-test.git
+[submodule "database"]
+	path = database
+	url = git@git.jd.com:jd-blockchain/database.git
diff --git a/database b/database
new file mode 160000
index 00000000..15a81ac0
--- /dev/null
+++ b/database
@@ -0,0 +1 @@
+Subproject commit 15a81ac0be162ed6553e8c219432ac56dc669d9f