Abstract: Aiming at the possible environmental impacts during mine-fill with the coal gangues from Yanma mine,two dynamic leach experiments were designed under simulation conditions in laboratory for analyzing the control effects:one is to mix coal gangues with clay uniformly,another is to fill the coal gangues and clay into layers seperately.It can be seen from the experimental analysis that in two controlled experiments,the absorption and transformation functions of clay layer have a certain effect on the control of stripping of harmful elements.Considering the layering treatment have better effect on the control of stripping of F^-,it is suggested that the layered treatment should be chosen during mine-fill with coal gangues.