Non-uniformity of infrared focal plane arrays is one of the key problems that must be solved before its quantitative applications. The moment matching method is adopted in correction of infrared non-uniformity. Due to the disadvantages of the method, such as changing of the image spectral variance and possibly producing new stripe noise, by comparing the output and the mean value difference for each detector between before and after the standard moment matching correction, an improved moment matching method based on the standard deviation value compensation is proposed. The quantitative and the qualitative analysis results show that the proposed method improves the non-uniformity correction precision, while the spectral variance of different objects in original image is better retained.