Target Simulator could simulate Infinity Distance Dynamic Target with Optical Characteristics. It provides simulative target for IRST to test its technical indexes of target detecting on the ground. A scheme of Off-axis RC Target Simulator, which has high resolution and Compact Characteristics. This scheme not only could simulate full wave optical Characteristic target of high resolution, but also Use full aperture Light of Compact optical system. The results show that the focal Length is 800mm, the aperture is 130mm, the length is 290mm,the width is 190mm, the height is 190mm, the modulation transfer function of full wave near diffraction-limited , the distortion is less than 2%,and the weight is less than 10kg.