The colorimetric method for real-time measurement of temperature field using ICCD as sensor was devel-oped. In order to ensure the accuracy and sensitivity, the relationship between the ratio response of two-color imagesand radiant property of body, transmission property of filter, spectral response of ICCD is discussed. The analysis isbased on computer calculation of the established mathematical model. On the basis of the analysis, optimum wave-lengths are obtained for a given sensor system. Experimental work was carried out to check the correctness of the theo-retical results. The method is useful for general purpose of study and design of the developed system.