Due to the lack of detailed field data recording the dam breach process, most of the models for overtopping-induced dam breach analysis of earth-rock dams have not been fully validated. In view of this problem, 17 models for analysis of mechanisms of earth-rock dam breach are summarized. The BREACH model, DB model, and IWHR model were used to simulate 1/3 of the accidents involving the Tangjiashan barrier dam breach, and the differences between measured and calculated results regarding the erosion rate of dam materials, discharge curve, and water level curve were analyzed. The influences of cohesion, the internal frictional angle, the non-uniformity coefficient, and porosity of dam materials on the discharge curve were studied with the BREACH model. The results show that the peak discharge predicted by the IWHR model is the highest, followed by those predicted by the BREACH model and DB model; the time, corresponding to the peak discharge, obtained by the DB model and IWHR model, is earlier than that obtained by measurement, while the corresponding time obtained by the BREACH model is later than that obtained by measurement; with the increase of cohesion and the internal frictional angle, the calculated peak discharge decreases and the corresponding time is delayed; with the increase of porosity and the non-uniformity coefficient, the peak discharge increases and the corresponding time comes earlier; and the non-uniformity coefficient and porosity have a significant influence on the calculated results regarding the dam breach.