This text solves the basic and important frequency estimate problem in communication by synergetic neural network. Basing frequency estimate in satellite communication, concretely studies the frequency estimate about BPSK signal. When the large Doppler frequency is partitioned several smaller area, each order parameter stands for each area. Once get the winner of the order parameters, the smaller frequency is confirmed. The approximation of the adjoint vectors simplify the complexity of arithmetic, but the system error is caused. This method has rapid capture speed, and smaller cost by analyzing and simulation.