Abstract: Landslide hazard control is a systematic engineering work. Thus the effect evaluations of countermeasure to landslide hazards are more complicated. Based on the analysis of a great deal of site investigation and comparative study, this paper makes an exploratory research on the effect evaluation by the principle of system analysis. Combined with quantitative and qualitative evaluation method, this paper proposes an assessment approach with multi-levels and multi-factors. The index systems of each sub-goal are established according to the whole process of landslide hazard control. They include survey, design, construction, and monitoring work. The comprehensive evaluation model is called as the "assessment effect of index(AEI)".It can ensure that the evaluation approach of countermeasure efficiency for landslide hazard is valuable. It is established by the results of each sub-goal and the analysis of "slope instability index(SII)".The application case shows that this approach can obtain a comprehensive analysis and effect evaluation of landslide hazard control.