For the problem of beam position arrangement in a small search region fo r tracking and guiding radar of near space hypersonic targets,a new method for confirming the optimal model is proposed.Firstly,based on the analysis of different beam position arrangements′ influence on the energy requirements and search performance of tracking and guiding radar,the optimal beam position arrangement patterns are given in th is paper.According to the analysis of the beam width extension influence on beam position arrangement,the compensa tion method for beam width extension is also given.Then,based on the static optimal beam position arrangement model,a method for confirming the static optimal model with genetic algorithm (G A) is presented.At last,the dynamic matching of the beam position arrangement is studied by using the speed guidance information,and the update t ime of the dynamic matching is also given.Simulation results show that the proposed method makes the tracking and guiding radar capable of covering continuously with high probability for the targets in hypersonic moveme nt ,improves the detection performance of the tracking and guiding radar,and av oids the waste of search resources.