Are you asking the question "How to turn off the iwatch when it starts up when playing QQ music on the phone?"? Here's how to do it:

1. Open the Watch app on your phone and make sure you're on the "My Observations" tab (shown in the bottom bar).

2. Tap "General", scroll down a bit and tap "Wake Screen". The third option is the option you are looking for: Automatically launch audio applications.

3. Click the slider next to "" to change it from green to black.