The STAP of the forward looking airborne radar (FLAR) is studied. A scheme is presented, which is processed by the way of STAP combined with using multiple staggered medium pulse repetition frequencies (MPRFs). In addition, the selection of PRFs is further discussed to make the scheme more available for FLAR. The performance and range/velocity blind zone of FLAR are also investigated by using 3-C approach. The experimental simulation results suggest that the scheme can improve the detection performance in all interesting ranges for FLAR.