In the paper,old and new dam settlement deformation status,dam seepage and dam slope stability are calculated according to structure safety assessment results and operation period monitoring data of Zhangze Reservoir in2008. Analysis results show that the inclination value of all monitoring points in the same is not higher than the critical damage inclination value. The possibility for the dam surface to produce risky longitudinal and transverse cracks is low.Overall seepage condition of the dam is normal w...