Single photon detection technology is becoming a development trend in laser detection technology due to its high detection sensitivity and long detection distance, which has attracted a lot of attention from domestic and foreign research teams. Using a kHz high-frequency pulse laser as the laser pulse emission source and a 64 × 64 Geiger mode APD array as the detector, short range target experiments are conducted under daytime environmental conditions. By fitting the histogram of photon echo response before and after noise filtering, the standard deviation of Poisson fitting parameters for pixel［30 28］after noise filtering is 1.16, the standard deviation of normal fitting parameters is 0.22 and 0.16, and the expected values are both 130.11. Pixel［40 35］also exhibits the same characteristics. The results indicate that normal distribution fitting has higher accuracy and can provide reference for simulation analysis of photon echo response.