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In view of the engineering implementation problems existing in the implementation of DQPSK transceiver by AD9361, the AD9361 configuration based on SPI interface is completed. Through the test, it is determined that the clock rate of SPI interface higher than 40MHz will lead to no waveform at the output end, the frequency difference of ad9361 system clock will lead to the distortion of local oscillator time domain waveform between reception and transmission, and the output balun matching frequency is 2.4GHz There are four difficult problems of random phase error between transmitting local oscillator and receiving local oscillator. They are solved by four methods: 10MHz SPI clock, 40MHz system clock, 1.4GHz output and demodulation by dot product cross product. The results show that the related problems are solved well, and the transceiver performance of DQPSK is reliable.