In 2013, the Heilongjiang River Basin experienced the largest flood since 1984, and so was the Songhuajiang River Basin since 1998. This paper firstly introduced the meteorological background and precipitation process of the rainstorms that led to the flood, then analyzed the flood process and composition, role of water structures, comparison with historic floods, and characteristics of the storm flood. The analysis of this paper could provide some reference for flood control in river basin.