Abstract: Because of the lack of measured floods data series in preliminary design in 1984, analysis on flood control capacity of Kezier reservoir this time added the series of consecutive floods from 1983～2006. After review, it was found that the status of flood control capacity of the reservoir was less than the design flood standard (1／1000). Engineering measures should be taken to improve flood control capacity. At the same time, the reservoir was located on sediment-laden river that its siltation was serious. With longer running time, flood control capacity of reservoir would be reduced. It was recommended that further study of reservoir siltation reduction measures should be carried out.