需要工具：个性聊天背景图、手机QQ
步骤：
1、开手机QQ，并且登陆账户，进入首页面；
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https://iknow-pic.cdn.bcebos.com/5ab5c9ea15ce36d3ec34a11333f33a87e950b1e4"/>
2、设置；
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https://iknow-pic.cdn.bcebos.com/aec379310a55b31930f0a0564aa98226cffc1783"/>
3、设置聊天背景，可以从手机相册中选。
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https://iknow-pic.cdn.bcebos.com/d4628535e5dde711f98561d5aeefce1b9d1661b9"/>
4、选择自己选的照片、图片。择了某一背景图片，会出现一个方框，选择合适的部分裁剪作为聊天背景图；
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https://iknow-pic.cdn.bcebos.com/9358d109b3de9c825698dbac6581800a19d84317"/>
5、点击确定，查看聊天界面，背景图片被更换了。
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https://iknow-pic.cdn.bcebos.com/4ec2d5628535e5dd8fa187fc7fc6a7efce1b6207"/>