Aiming at the problem of grayscale difference in multispectral images of aerial filter array, a new method of the strip grayscale correction algorithm is proposed in this paper. Firstly, the strip image template is constructed for multispectral image, and the scale invariant feature transform algorithm is used to extract image feature points and calculate inter-image coordinate transformation matrix, which is used to determine the overlap region of strip image. secondly, calculating the mean value of the grey level of pixels in the overlapping area of each strip image,and fitting the grey levelcorrection coefficients between adjacent images, using the grey level of each strip of intermediate image as a reference. Finally, the projected image templates are used to extract sequential singleband stripin turn and stitch them together to obtain a single-band image with same grey level. Experimental results show that this method can effectively solve the difference in the grey level of multispectral image strips of aerial filter array, and can maintain the maximum spectral information characteristicsof the feature.