Abstract: Weihe river basin of Xinxiang city belongs to the upper reaches of Haihe River basin. In recent years, floods and droughts occur frequently. The total daily data of internal Weihe and seven hydrological sites from 1963 to 2016 was collected and researched. The biggest flood data of one day, three days,seven days, fifteen days, thirty days of each year were calculated. The moving average method and the Mann-Kendall trend test method and other statistical methods were adopted to analyze the data and get the conclusion of the regional flood overall variation law and mutation time.