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To achieve the large field of view, it establishes the whiskbroom imaging model based on the rotating mirror.Comparing the whiskbroom and pushbroom models, it finds that when the roll angle is two times of the angle of the swing mirror, the pushbroom and whiskbroom has the same field of view. Through the experimental verification, at the small angle attitude 2°、4°、6°、8°、10°,the relative error of this model is within 1% and relative error of drift angle is within 0.001% of the pushbroom imaging model. Two ways have good consistency, ensuring the rationality and accuracy of the model. Besides, the model can scan imaging across the navigation direction by controlling the rotation of the swing mirror in real time to realize large field of view, wide swath of imaging, reducing the return period and improving the working efficiency of the space camera.