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Can you provide more information on the issue you are facing with the watch function in EChart chart data update in Vue? What is the expected behavior and what is the actual behavior? Without more details, it's difficult to provide a specific solution. However, here are some common reasons why the watch function may not be functioning properly:

1. Check to make sure the watch property name matches the data property name exactly.
2. If the data property is an array or object, you may need to watch for changes within the array or object.
3. Make sure you are not modifying the data property directly. Instead, make a copy of it and modify the copy.
4. Ensure that EChart is receiving the updated data correctly. You may need to call a chart.update() function after the data has been modified.

If you can provide more information about your specific issue, we can provide a more tailored solution.