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Through the geological investigation of karstcollapses of Zaozhuang，China，it is found that themechanism of kamt collapse in the area of over-pumping is characterized by the seepage effect andthat theseepage pressure effect related to over-pumping isthe original induced factor of the kamtcollapse.Accordingto the forming mechanism，the process of the karstcollapse can be divided into two phases ofthe inter-collapsephase and the surface collapse phase.Therefore。basedon the theory of М·М·Протодьяконовand the limit equilibrium theory，this paper has establishedthe mechanical models in surface-collapse phaseand determined the height of equilibrium arch ofsoil-hole in inter-collapse phase. Meanwhile，anevaluationon the karat collapses of Zaozhuang city，China，hasbeen completed by means of mechanical models.Theresults show that the mechanical medeh agree with theforming mechanism of kamt collapse of Zaozhuang city. Thus，it is proved that the karst collapse models canbe used in the evaluation of the kamt collapses inover-pumping area.