The performance of laser detecting system is influenced by the design of photoelectric detecting cir. cuit. According to time domain characteristic, the design of narrow pulse laser detecting circuits are analyzed in de. tail, which include the affection of the photodiode bias voltage on detecting circuit and the affection of photocurrent conversion mode on signal bandwidth. In order to improve the SNR of laser detecting system, the optimization methods of bandwidth design for amplification circuits and compesation circuits are presented. The parameters de. sign bases of preamplifier stage circuits for narrow pulse laser detectors are provided. And optimization and design methods of detecting circuits are introduced in detail. Effective design methods are provided for the design of photo. electric detecting circuits.