1. First, confirm that the applewatch has been correctly paired with the iphone via Bluetooth and wifi and kept connected. On the iphone, open the health application, enter the health data or fitness record section, and find the data source or data access rights.

2. Secondly, in the data source list, edit the sorting or set preferences to ensure that applewatch is the preferred data source, especially in the step count. If you want to synchronize sports data to third-party applications such as WeChat Campaign, you need to find the corresponding health data access settings in these applications, such as authorizing Apple to synchronize data in WeChat Campaign.

3. Finally, although applewatch and iphone will automatically synchronize data, if you find that the data is not updated in time, you can wake up the Apple Watch application on iphone, touch the "My Watch" tab, then scroll to the bottom, and click "General" or "Synchronize all data" for manual synchronization.