1. Restart the watch and mobile phone: try to restart the watch and mobile phone first, and then try to pair. Sometimes restarting the device can solve some temporary problems.
2. Check the Bluetooth connection: Make sure that the Bluetooth function of the watch and mobile phone is turned on, and the Bluetooth connection of the watch is not occupied by other devices. Try to remove the pairing information of the watch from the Bluetooth settings of the mobile phone, and then pair it again.
3. Update the software version: If the software version of the watch or mobile phone is too old, there may be compatibility problems leading to unsuccessful pairing. Please make sure that the software of the watch and mobile phone is the latest version, and try to pair again.
4. Clear the watch cache: Sometimes the cached data of the watch may cause pairing problems, so you can try to clear the watch cache. The specific operation method can refer to the instruction manual of the watch or contact Huantai Health Customer Service for consultation.
If the above methods can't solve the problem, it is recommended to contact Huantai Health's customer service team and describe the specific situation to them. They may provide more detailed help and solutions.