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In order to improve the accuracy of speed measurement and the adaptive range of projectile diameter, a logarithmic amplifying circuit with automatic gain adjustment is designed to expand the dynamic range of signal processing circuit.This paper analyzes the working principle of two kinds of typical light curtain: rectangular light curtain and fan-shaped light curtain, and analyzes the relationship between the signal amplitude of projectile passing through the curtain, the diameter and position of projectile passing through the curtain. According to the characteristics of the logarithmic amplifying circuit, the voltage-type logarithmic amplifier circuit based on TL441 and the current-type logarithmic amplifier circuit based on LOG112 are designed.The logarithmic amplification characteristic and dynamic range of the designed circuit are tested.The test results show that the input and output signal amplitude of the designed signal processing circuit has logarithmic characteristics, and its dynamic range can reach 31dB, which improves the dynamic range of the light curtain target test, and meets the speed measurement of various caliber projectiles