Abstract: This article uses the initial disturbance of a hemispherical instantaneous impact crater as the initial condition to establish a deep water wave model for tsunamis induced by near-Earth object impacts. Applied to specific situations (Asteroid with a diameter of 140 m, impact velocity and density using Cheryabinsk impact parameters, average ocean depth in the impact area using Pacific average depth of 4 km), the evolution of the maximum wave height of near-Earth object impact induced tsunamis with distance and time was studied. By comparing the effects of different instantaneous impact crater shapes and impact models on the wave height of impact induced tsunamis, it was found that the tsunami harm caused by hemispherical instantaneous impact craters is greater than that caused by parabolic instantaneous impact craters; Compared to the deep water wave model, the simulation of the shallow water wave model shows a larger scale of tsunamis; For medium-sized asteroids with a diameter within a few hundred meters, it is more suitable to use a deep water wave model with an instantaneous impact crater shape of a hemisphere to study their impact on the ocean induced tsunami.