In order to realize the specific spectral response of the detector, full-color filter method can be used to calculate the match plan of color filter. During the calulation, normal spectral transmittance of the filter often be employed as the calculation basis. In many practical applications, obliquely incident light will lead the disagreement between calculated result and the actual result.In this paper, the caculation method of diffuse incident spectral transmittance about the cylindrical color filter is analyzed; a correcting model which can derive the diffuse incident spectral transmittance from normally incident spectral transmittance is proposed; a experiment system is designed for diffuse incident spectral transmittance measurment based on double integrating sphere. A set of experiments are employed to evaluate performance of the correcting model. The measurement results show that the correcting model can effectivlly derive the diffuse incident spectral transmittance from normally incident spectral transmittance with obviously lower match error. The agreement between actual measurement result and caculated result is observably improved by applying the correcting model to full-color filter method.