As the failure rate of the CINRAD radar is much greater than that of WSR88D radar, the faults occurred in the earlymade CINRAD/SB at Zhoushan are summarized and analyzed, and the causes of those faults are discussed. Those faults are statistically classified according to the causes, location, and time; and the repairing procedures for some type faults are simply described. The results show that so long as the technological level and design of the CINRAD radar in the process of production, installation, and adjusting are improved continuously， the fault rate of CINRAD can decrease efficiently.