1. First open the browser on your computer, Baidu "Sina Weibo" and enter the official website, as shown in the figure below.

2. Then in the Weibo main page that opens, click Account Management at the top of the page, as shown in the figure below.

3. Then in the account settings window that opens, select Bind Account, as shown in the figure below.

4. Then in the page that opens, choose to modify the bound QQ number, as shown in the figure below.

4. Then in the page that opens, click Unbind, as shown in the figure below.

5. Finally, in the window that opens, click OK to unbind.