To investigate the impact characteristics of a launch vehicle equipped with inclined nozzle engines on a new type of launch platform， a rocket gas jet model is established based on the three-dimensional compressible multi-component transport Navier-Stokes equations， the Realizable k-ε two-equation turbulence model， and the total variation diminishing （TVD） discretization scheme. This model is then compared with experiments to validate the accuracy and precision. Through numerical simulations， the effects of jet impact on the launch platform under different takeoff heights and impact directions are studied， and the rocket drift phenomenon is considered. Results show that the plumes from the two engines merge into one， and the inclination angle of the nozzle leads it unable to pass vertically through the hole. As the takeoff height increases， the impact area of the gas flow gradually moves to the upper surface of the front equipment room， forming significant thermal and mechanical loads， and the drift phenomenon accelerates this process. As the takeoff height further increases， the peak load on the platform surface gradually decreases， but the impact area continues to expand. The simulation results can provide a basis for the thermal protection design of the new launch platform and the strength verification of the steel frame structure of the front equipment room.