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Landslide dam,always triggered by the strong earthquake and heavy rain,is a common natural disaster around the world.In this study,a coupled model was built by combining DB-IWHR model and the two-dimensional hydrodynamic model to simulate the landslide dam flood discharge.We mapped the maximum Baige landslide dam flood inundated area based on Gaofen-1 imagery,and then simulated the process of Baige landslide dam flood discharge using this coupled model.It was proved that,with 80.05％ F values,the coupled model was suitable to simulate the process of landslide dam flood discharge.Lastly,multiple scenarios were simulated respectively by setting varying width and depth of spillway.The results of scenarios 1-4 indicated that spillway width presented low sensibility to the peak flow in spillway and the time of its arrival,and similarly to the water depth at river cross-section and the inundated area.Water depth at river cross-section and the inundated area decreased as spillway width increased.Even if spillway width varied at 10 m interval,the average variation of water depth was less than 1.82 m and the variation of inundated area was less than 2.85％.However,the results of scenarios 5-8 indicated that spillway depth was sensitive to the peak flow in spillway and its arrival time,and also to water depth at river cross-section and the inundated area.Water depth at river cross-section and the inundated area increased first and then started to drop with spillway depth kept decreasing.When spillway depth varied at only 2 m interval,the average variation of water depth at river cross-section basically exceeded 2 m and the variation of inundated area was more than 2.85％.