Guangzhou is in the province of Guangdong, which has been badly hit by Sars, with more than 1,500 cases.
Around 240 people have now died from Sars in China.
But there have only been a handful of cases in the UK, so the chances of getting it are very slim.
Officials in Guangzhou say the anti-spitting patrol is also aimed at encouraging good manners.
In the past, China has launched lots of campaigns to stop people spitting.
Many people say they do it to clear their throats because the air is polluted.
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