The Ministry of Civil Affairs said that about 3.7 million people in seven provinces, including Hubei and Sichuan, have been hit by flooding, landslides and mud flows since Saturday.
At least 20 people have been reported missing.
Direct economic losses due to the flooding has hit 2.68 billion yuan (USD 407.9 million), the ministry said.
More than 2,400 homes were damaged and 20,900 hectares of crops were destroyed in the summer rainstorms, which were heavier than usual this year.
Eight people were trapped in a flooded coal mine in the southwestern Guizhou Province, state-run Xinhua news agency reported and added that torrential rain is forecast to continue in south China over the next three days.
The seasonal rains cause heavy flooding in China every year, usually affecting the country for around two months beginning in late May.
