In the wireless communication, the best sampling point location of signal receiver bit synchronization output has the big influence to the function of whole receivers. Aiming at this problem, this paper put forward a bit synchronous algorithm based on the complex correlation, according to add the result of complex correlation and make use of the receiving signal to normalize, and then provide the related calculation parameter for the follow-up at the same time of acquiring the best sampling point location, and simplify the algorithm and save the hardware FPGA resources. Finally, the simulation and actual experiment are finished in VIVADO development software, the result shows that the performance index of bit synchronization which realized by this algorithm is higher and play an important role in the whole demodulation algorithm.