Abstract: To solve the precise measurement problem of ablative model’s temperature and material emissivity, this paper has presented a method to measure ablative model’s surface emissivity in 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 basalt blunt body ablation test, based on image processing and coefficient standardization result, the temperature of 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.