Abstract: To solve the precise measurement problem of ablative model’s temperature and material emissivity, this paper presents a method to measure the ablative model’s surface emissivity in the high temperature flow field based on CCD camera images. Ablative model’s image is obtained through CCD camera. For preprocessing, the image is denoised by non-local mean filtering algorithm and segmented based on its color information. Then the CCD camera’s spectra response coefficient is standardized through the basalt blunt body ablation test. Based on image processing and coefficient standardization result, the temperature of the basalt blunt body and ablative plate model is simulated by colorimetric thermometry. Finally, ablative model’s surface emissivity is determined by the correlation between emissivity and temperature.