This work proposes a strategy of designing the optical heteromorphic window which comprises a pair of symmetrical conformal internal surface and correction external surface that are determined using ray tracing. An experimental system is set up to analyze the characteristics and correction of image distortion of the optical heteromorphic window. A correction model of two-order polynomial imaging distortion is proposed and then applied to distorted image correction. The results show that after passing through the optical heteromorphic window, the parallel light has obvious deflection, resulting in uneven brightness distribution and bright and dark spots. At the same time, the image of the calibration board is translated, zoomed, and rotated, and its distortion characteristics at different positions are different. By constructing the correction model, the distorted image is corrected, and the corrected image is highly coincident with the original image. The coordinate difference of each corner point is less than 1 pixel(7.4 μm), demonstrating that the correction model has high precision. The design of the optical heteromorphic window and the development of the correction model contribute to obtaining an accurate internal flow field structure in the inward-turning inlet.