Precipitation concentration degree of flood season in the central China

In this paper the data in central China from routine meteorological station and registering rain gauge were used to get the precipitation of every per hour. The feature of the precipitation and its interannual and interdecadal variations were analyzed. The results showed that, the rainfalls in flood season of central China were differences in spatial and temporal distribution. The precipitation concentration degree had an increasing trend in May and September, and a decreasing trend in June, July and August. In the northern part of central China, the precipitation concentration changed variously, and in the south part its change was weak and its annual variation was small. In July, the precipitation concentration degree was small, and the precipitation was homogeneous in space.