Local officials used dynamite to destroy a dam on the minus river in Anhui province this early morning to reduce pressure from the floods.
China Central Television (CCTV) said that after the dam burst, the water level on the minus river was expected to fall by 70 centimeters.
The move comes amid rising water levels in many Chinese rivers, including the Changjiang River, which are rising abnormally due to heavy rains that lasted more than a month.
Dams and embankments to release water are an extreme measure to cope with the floods that were used during the historic flood in 1998 in China, killing more than 2,000 people and nearly three million homes being destroyed.
Last week, the Three Gorges Dam on the Truong Giang River opened three flood gates when the water level behind the giant dam rose 15 meters above the flood level.
On the same day, China raised flood warnings in the area along the Hoai River in the eastern part of the country from level two to level three on a four-level ladder.
Hoai River is more than 1,000 km long, is the fourth longest river in China, flows through major agricultural and production centers in Henan, Anhui, Jiangsu and empties into the Truong Giang River.
China suffers floods every year, especially in the central and southern regions, but this year's flood has caused serious impacts.
Chinese officials have spent nearly $ 86 million on damage to Jiangxi, Anhui, Hubei, Hunan and Chongqing cities, but the damage could amount to $ 12 billion.