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Thermal deformation measurement of the high-speed aircrafts under the high temperature is significant for reliab ility assessment, life predict ion, and safety design for the materials and structures. This paper presents a digital image correlation method to accurately measure the full-field thermal deformation of co mposites under the environment of high temperature. First, real-time deformation images of experimental objects under different loads are acquired with CCD cameral. Based on the digital speckle correlation theory, the bilinear interpolation algorith m is emp loyed to measure the thermal deformation. Last, the co mparative analyses on measurement results by the proposed and traditional methods are conducted, as well as factors impacting measurement errors are analyzed.