Abstract: To address the issue of local oversaturation caused by non-uniform spectral response rates during the spectral detection of hypervelocity impact flashes and explosion flashes, a spectral perception optimization scheme based on spatial light filtering was proposed. Based on the known distribution patterns of flash spectral intensity and the spectral response functions of the detection system, a spatial light filter was designed and fabricated using polyethylene terephthalate (PET) film material. By adjusting the grayscale values, different attenuation coefficients were applied to various wavelength bands within the 400 nm to 800 nm range. This approach not only attenuated the high-response-rate bands but also equalized the response coefficients across all bands while retaining the ability to detect weak spectral signals. Additionally, third-order least squares method was employed for wavelength shift calibration. Experimental results show that the standard deviation of the response coefficients is reduced from 0.265 0 to 0.032 9, a decrease of 87.59%. The variance is correspondingly reduced from 0.071 1 to 0.001 1, a decrease of 98.54%, with the wavelength shift being less than 0.4 nm. Simulated experiments under high-light-intensity conditions demonstrate that the originally saturated light signal characteristic peaks become visible, and the characteristic peaks with lower intensity are retained and not submerged in the noise.