A total of 1,145 cases dengue fever cases have been confirmed with 31 people in critical situation, an official statement said.
Ninety per cent of cases are confirmed in Guangzhou, capital of south China's Guangdong province.
There have been no deaths reported, Xinhua news agency reported.
South China Guangdong Province has initiated emergency measures for its prevention, the statement said.
Zhang Yonghui, director of the Guangdong Provincial Centre for Disease Control and Prevention, appealed to all citizens to take self-protective measures against the eradication of mosquitoes to prevent dengue fever.
September to November will be the time of dengue outbreak and efforts are needed from the people for its prevention, Zhang said.