During hypersonic wind tunnel tests， the pose information of a model supports the reliability of the experimental data， and the measurement accuracy of these data has a significant impact on the test results. Binocular vision measurement systems can measure the attitude parameters of free flight test models in a hypersonic wind tunnel. The system is usually placed outside of the wind tunnel test section and observes the model through a glass window situated on a wall of the test section. However， the glass window distorts the image and reduces the measurement accuracy. This paper proposes a measurement method to correct the glass window distortion. By modeling the image surface distortion caused by refraction through the glass window， a correction method is proposed based on the linear fitting of marker points to eliminate the image distortion and improve the measurement accuracy. Moreover， a binocular vision measurement system is developed at the scene of the Φ 1 m hypersonic wind tunnel test， and a six degrees of freedom attitude of a free flight model is successfully measured. The results show that the measuring accuracy was greater than 0.5 mm when the measuring range was 1 m × 1 m × 1 m. Therefore， the system satisfies the requirements of subsequent pneumatic data analysis.