Abstract: Multi-transmit multi-receive (MTMR) is an important mean to improve the positioning accuracy of the radar system. To analyze the positioning accuracy of different MTMR systems, we use two-dimensional positioning GDOP analysis method to simulate the systems of two-transmit two-receive, two-transmit four-receive and three-transmit three-receive (2T2R, 2T4R, 3T3R). The results show that: compared with the 2T2R, the positioning accuracy of the 2T4R system is overall improved and the improvement much more obviously in the near baseline zone; the 3T3R overcomes the defects of the 2T2R that has positioning blind zone on the baseline, however, compared with the 2T4R, positioning accuracy of the region rounded by the three stations is not obviously improved except in the near baseline zone. The simulation results provide theoretical reference in MTMR detection system selection and radar station deployment, and thus is valuable to radar configuration applications.