1. The other party sets privacy protection: when the other party sets his circle of friends to be visible only to some friends or only to himself, other users will not be able to view the contents of his circle of friends, only to see the black background.

2. Network problem: Due to unstable network connection or other reasons, WeChat can't load the photos and contents of the other party's circle of friends normally, so it only displays a black background.

3. WeChat version problem: Some WeChat versions may have some bugs or compatibility problems, which makes it impossible to display the content of the other party's circle of friends normally.