Abstract: Engineering geological problems such as karst leakage,karst collapse,and karst foundation stability often occur when building reservoirs and dams in karst depression areas. However,karst depression has the advantage of natural space resources,which makes it have great potential in building dams and reservoirs. From the perspective of engineering geology,this paper aims at the suitability evaluation of pumped storage power station in karst depressions by building an assessment index system for the suitability assessment of reservoir construction in karst depressions. There are 10 indicators selected for the analysis,including karst depression location terrain slope,natural reservoir capacity,terrain enclosed conditions,lithology formation regional structure,karst development degree,karst hydrodynamic conditions,water head difference,and the ratio between length and height. Based on the in-depth analysis of the influence of each evaluation index on the site selection of reservoir construction in depressions,the quantitative classification of each evaluation index is carried out. The weight of each evaluation index is determined by using the analytic hierarchy process,and a mathematical model for evaluating the suitability of depression reservoir construction is established. This research results show that the degree of karst development,natural reservoir capacity,karst hydrodynamic conditions,and water head play a key role in the decision-making of reservoir location in depressions. The research results in this paper transform the site selection of reservoir construction in depressions from qualitative analysis to quantitative evaluation,which makes the site selection of building dams and reservoirs in karst depressions much more scientific and rationality thus providing reference and guidance for similar projects.