Objective The paper is to perfect complete the QA process by developing of the method used to fast verify the center position of body patient which are treated with Cynthia Gamma Knife.method The research used the method of the coordinate transmission which the isocenter of body is transferred to the phantom by making use of laser cross center.Verification of the isocenter of patient treatment adopted the model method.Results The largest error of position is 1.5mm between the plan target spot and the actual measurement target spot.Conclusion The method is fast and reliable,which is used to fast verify the isocenter of body patient treated with Cynthia Gamma Knife.