Based on the requirements of high resolution and wide field of view, considering the restrictive off-the-shelf detectors, the design method of split Field of View (FOV) is developed. The principle of split FOV is analyzed. A spaceborne high resolution hyperspectral imager with wide FOV is designed using the method. The hyperspectral imager are composed of a 11.42° telecentric off-axis Three-Mirror Anastigmatic (TMA) telescope and two Offner convex grating spectral imaging system. Ray tracing, optimization and analyzing are performed by CODE V software. The analyzed results demonstrate that the Modulation Transfer Function (MTF) for different spectral band is more than 0.7, which satisfies the pre-designed requirement.