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For synthetic aperture radar seeker, the trajectory and the viewing angle have an effect on the azimuth resolution of imaging. As the terminal guidance phase using squint mode, guidance law must be designed rationally to satisfy squint condition. Based on variable structure theory, pre-fixed angle guidance law is designed. The guidance law proposed could solve the constraint problem of synthetic aperture radar seeker effectively. In designing the guidance law, missile-target relative motion model and sight angle variation model with terminal angle constraint are built at first. On this basis, pre-fixed angle guidance law is designed by variable structure control method. Then, the performance analysis on pre-fixed angle guidance law is carried on, and the general attack characteristic is obtained. At last, correctness and effectiveness of the method are verified through the simulation.