Abstract: In this paper, based on the geographical location and the running character of the Gan Lan Ba power station reservoir, the problem of the reservoir inundation is analysed and evaluated by the characteristic level of reservoir. And,according to the investigation on the influence on the peripheral inundation area of the inland lakes of dian chi,yangzonghai in Yun nan province, the inundation area is divided into severe inundation area, medium inundation area and slight inundation area .As a result, the handling measurements and advices are brought forward for the different degree of the inundation influence.