As light propagates through the atmosphere, light rays are distorted due to random variations in the index of refraction caused by atmospheric turbulence. This causes degradation of the images of astronomical object captured with a ground-based telescope. In order to overcome the atmospheric turbulence as the past 20 years, people made many designed to eliminate the atmosphere of high-resolution imaging method. Phase diversity is an effective post-processing method that can be used to overcome the turbulence-induced degradation. The method uses an ensemble of short-exposure images obtained simultaneously from multiple cameras to jointly estimate the object and the wave-front distribution on pupil. Phase Diversity (PD)[1] is to use focused and defocused images through a phase like diversity fitting algorithms to recovery phase or on the target. This requires two images, one is of the focused plane, and the other is from the defocused plane. In this paper the design's purpose is to image the two images into a CCD，At the same time ensuring the equal intensity of the two images with high signal to noise ratio. This paper presents a new sensor design and analyses its aberration，then simulate the solution of the PD wave-front sensor.
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