Abstract: There is low computing efficiency of the ray tracing model for 3G network planning.A acceleration method of ray tracing based on dynamic zoning is proposed，after the analysis of the deficiency of kinds of acceleration methods.This method divides districts according to distribution of the buildings of the urban microcell，and solves the problem that the method of static division can not zone for complicated environment uniformly in micro cellular environment.The simulation results show that the proposed method possesses the merits of high computing effciency，compared with known method of zoning on the condition of same prediction precision.