diff --git a/devicemodel/samples/apl-mrb/launch_uos.sh b/devicemodel/samples/apl-mrb/launch_uos.sh
index 50512afc6..f19c62944 100755
--- a/devicemodel/samples/apl-mrb/launch_uos.sh
+++ b/devicemodel/samples/apl-mrb/launch_uos.sh
@@ -391,6 +391,8 @@ echo "-V 5 means just launching 1 alios UOS"
 echo "-V 6 means auto check android/linux/alios UOS; if exist, launch it"
 }
 
+echo "dm_run: start UOS" > /dev/kmsg
+
 launch_type=1
 debug=0