Abstract: According to mining conditions in ash dam body and hydraulic construction region,the movement and deformation of ash dam and its subordinate hydraulic construction were calculated by choosing proper parameter.The result showed that ash body and hydraulic construction withstood the grade Ⅱmining influence.Scene survey result showed that ash dam body and hydraulic construction was influenced slightly by coal mining,and simple maintaining and reinforcement could eliminate the impact of mining.Coal mining and protection of ash dam body and hydraulic construction must be considered together.On the basis of ensuring the safety of ash dam and hydraulic construction,coal resource can be recovered properly.