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By analyzing the source of the incident shot noise, sky shot noise, dark-current shot noise, readout noise in the process of photometric measurements, it describe a method to reduce all kinds of these noise to improve accuracy of photometric measurement. Put forward an intelligent threshold noise reduction method for readout noise, dark-current shot noise and other residual noise. Substantially eliminate the impact of noise on the measurement results. Using stellar images before and after reducing the noise to calculate the photometric results, it can be seen that the method improved photometric accuracy from the original 0.314 Mv to 0.092 4Mv. It increases the accuracy of obvious effect and resolves instability problem of the photometric measurement using CCD.