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With the development of measurement technology, lidar technology has become a research hotspot The integrated APD array avalanche diode working in Geiger mode is selected as the photodetector of lidar, and the laser pulse with rising edge of 5ns is selected in the range of detection distance of 100-200m, then the receiving bandwidth is in the range of 70MHz~88MHz, in which the APD detector converts the received echo signal into electrical signal, and the TIA transimpedance amplifier is used to reverse amplify The current signal is converted into a voltage signal by the TIA transimpedance amplifier, and the signal is effectively amplified and input to the moment identification circuit, which is implemented with a voltage comparator, and finally the COMS logic level signal can be output. The simulation results show that the gain dynamic range of the TIA amplifier reaches 54 dB within the receiving bandwidth, and the overall circuit delay is about 10 ns.