Abstract: Using the diurnal precipitation data sets of 2474 stations from 1961 to 2013 and the relevant NCEP/NCAR reanalises data, the precipitation concentration period (PCP) is firstly defined as the shortest time, during which the precipitation accounts for 45% of the total amounts from May to August, with 40% from May to September for the Hetao region and the central Sichuan basin.The precipitation concentration period's climatic state and variation characteristics were discussed. It is found that: (1) PCP occurs earliest to the north of South China but latest in the Hetao region and the Sichuan Basin. (2) PCP ends earliest in South China and a larger part the area south of the Yangtze River, but latest in the Hetao region, the Sichuan basin and southern Tibet. (3) PCP can last 7 to 40 d, the shortest with 7 to 10 d is in desert of West China and the longest with 30 to 40 d in Southwest China. (4) PCP of China occurs with the Somali jet bursting out, and expands with the western Pacific subtropical high developing.And,(5) every regional precipitation during PCP has distinct regional characteristics, and it is prominent that the precipitation is lesser in 1980s, but more in 1990s in the areas north of South China and south of the Yangtze River.