If you can't watch videos after purchasing a membership in QQ, there may be the following reasons: 1. Internet connection problem: Watching videos requires an Internet connection. If the network is unstable or disconnected, the video may not be played. You can try to connect to the network again or change your device to watch it. 2. Video copyright issues: Some videos may have been authorized by the copyright owner to be played on other platforms or websites. Therefore, the purchase of a member of QQ Video cannot directly view the video. They had to wait for the copyright owner to give them permission or find other legal ways to view it. 3. Failure of the video system: If you encounter a problem that the video cannot be played after purchasing a membership, you can try to feedback and inquire on the official website or customer service website of the video. If none of the above methods can solve the problem, you can try to contact the customer service of QQ Video or find other legal ways to watch it.