Statistical analysis of radar failure based on three CINRAD/CC radar sets in Gansu Province in the past four years indicates that as a major failure component of the radar system, the data transmission system has a significantly increasing trend in failure with the increasing lifetime of radar. The main factors and causes of the failure are analyzed, and the improvement scheme is presented. It is suggested that the data transmission based on the standard network should abandon the optical fiber data transmission system and discard the optical terminals and the multiplex communication mode, use the terminal software developed by Anhui Sun Create Electronics Co., Ltd (Version 20), which newly integrates the network functionality, user permission feature, automatic generation of data and image products, data file indexing capabilities, voice alarm, and other functions. The operation of the improved radar data transmission system indicate that the failure rate of radar data transmission in the network optical fiber communication systems reduced; the radar system reliability and stability were enhanced; and the radar data transfer rate and efficiency improved, which help ensure the operation of new generation weather radar.