Based on the NCEP/NCAR 1°×1° daily reanalysis data and TBB(temperature of black body) data of FY2 satellite, the multiscale circulation features of heavy rain over Huaihe River Basin in rainy season in 2007 are studied. Results show that the main rainband is located in Huaihe River Basin in the rainy season. Specially, the heavy rain and rainstorm successively occurr in Huaihe River Basin from 30 June to 8 July, and the concentration degree and intensity of precipitation are stronger than those in 2003, which cause the greatest flood over Huaihe River Basin since 1954. During the rainy season, the Ural blocking high frequently emerges, and the west Pacific subtropical high is stronger than the normal with a stable location. When strong monsoon surge meets with dry cold air from middle and high latitudes, there will be heavy rain in Huiahe River Basin. The favorable relationships of the strong and stable west Pacific subtropical high, strong monsoon surge, dry cold air from middle-high latitudes and propagating eastward convection disturbance over the Tibetan Plateau lead to the heavy rain over Huaihe River Basin in 2007.