Abstract: Daily precipitation data at 54 national weather stations from 1960 to 2014 in Liaoning were used to analyze the temporal-spatial variation characteristics of the rainstorms and their intensities during the flood seasons (from June to September).The results show that most rainstorms appear in flood seasons based on data from 55 years,especially in July and August during which the number of rainstorms takes up 72% of the annual total.The number of rainstorm days decreases from the southeast to the northwest of Liaoning province and the rainstorm intensities decrease from coastal regions to inland regions.The lifetime for most rainstorms lasts about two days,and the number of occurring times at different regions is very different.The days,intensities and ranges of rainstorms vary little during the 55 years,with a 12-year variation period of rainstorm days and intensities and a 2-year significant period in 1990s.

Key words: Flood season, Rainstorm, Period