Abstract: Aimed at the superboom problem of flight vehicles under supersonic maneuvering conditions, a spatial model has been established based on the Lossy Nonlinear Tricomi Equation (LNTE) to characterize the nonlinear evolution process of pressure waves near the caustic. The equation is solved with the pseudo time step and the operator splitting algorithm in the time and frequency domains, and a computation code named ARI_Superboom is developed for the superboom problem. The overall procedure for analyzing the focus boom includes three steps. First, the whole flow field is obtained by solving the three-dimensional N-S equations using the in-house CFD solver ARI_Overset developed by the Aerodynamics Research Institute (ARI) of AVIC, based on which the near-field pressure is extracted. Second, the ray tracing and its propagation to the far field are calculated by another in-house code ARI_boom to obtain the sonic boom signature and caustic at a given height. Finally, the ground superboom information in the focus area is predicted by ARI_Superboom. The focus boom prediction method is used to predict the superboom on the ground generated by a supersonic vehicle under uniform acceleration, and the results verify the feasibility and accuracy of the present LNTE based method.