In order to solve the problems of complex forces, many nonlinear constraints and difficulties in trajectory design for glide reentry vehicle, the analytical solutions of trajectory are analyzed on equilibrium glide conditions. Based on the concept of equilibrium glide, the influence factors of reentry trajectory of glide vehicle are analyzed by simplified dynamics differential equations. Combined with atmospheric exponential model, the analytic relationship between initial trajectory parameters and velocity, range and altitude under the equilibrium glide conditions is deduced and verified by simulation. The simulation results show that the range of the glide can be increased by higher initial gliding speed and optimal initial incident angle of equilibrium glide, and the impact of reentry at different altitudes is not significant.