An automatic plot acquisition method based on the center of the mass is proposed to meet the needs of the real time and the precision in the data process of the 2D search radar. In order to obtain the results that one target has only one plot at the same time, the moving window integration is used to improve the detect probability and eliminate the wild value, the plots coalition and plots centroid are used to suppress the split of target. The general CPU platform, which has its flexible advantage, is adopted to carry out the complicated data process algorithms, such as target detection and plot centroid. The plot acquisition method is proved its quality of teal time by tests in actual environments, which only cost 10 percent of the antenna period by optimizing software. The tests also show that the general CPU has its application prospect in radar system with the fusion of the radar data process and the radar signal system.