The performance of the interference suppression of the satellite navigation systems is greatly affected by the inherent physical properties of the conformal antenna array. This paper compares and analysis the conformal antenna array's shielding effect in the interference suppression of the satellite navigation systems, and then proposes a multi-beam-forming interference suppression method based on sub-array division, which is able to enhance the output SINR of each satellite when the interference is suppressed in use of conformal array. A lot of simulation experiments are also given to show the priority of the proposed method.