@dazhi bai - Thanks for the question and using MS Q&A platform.
I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to accept the answer .
Issue: Azure Data Factory Sharepoint Online List connector can't preview data
Solution: Got it resolved by reconfigure spo site permission scope.
Ensure that the account used to connect to SharePoint and the SQL database has the necessary permissions to access the data. This account should have at least read access to the SharePoint list and write access to the SQL database.
If I missed anything please let me know and I'd be happy to add it to my answer, or feel free to comment below with any additional information.
I hope this helps!
If you have any other questions, please let me know. Thank you again for your time and patience throughout this issue.
Please don’t forget to Accept Answer
and Yes
for "was this answer helpful" wherever the information provided helps you, this can be beneficial to other community members.