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Among all kinds of faults of TWP3 wind profiler radar, the failure rate of transmitters is the highest. At present, there is still a lack of a transmitter fault diagnosis method suitable for the technical personnel of radar stations. Based on the working principle and key point signal characteristics of TWP3 wind profile radar transmitters, combined with fault statistics, the common faults of the transmitters are classified into six types of typical faults. By analyzing these typical faults, a method for diagnosing typical faults by means of the flow chart is developed, and three typical cases are analyzed. The results show that this method can diagnose the transmitter faults quickly and accurately. It has the characteristics of clear thinking, standardized operation and being easy to grasp by the technical personnel of radar stations. It can effectively shorten the repair time of transmitter faults and improve the technical support level of TWP3 wind profile radar.