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Unified S-Band transponder tracks phase modulate carrier and exports remote sub-carrier which is psk signal. Remote control Unit receives sub-carrier and demodulates psk signal by analogy circuit. It is a hard work to debug a very small bandwidth band pass filter when the bitrate is very low also the parameter of band pass filter is changed when undergo large range temperature fluctuate. Once the designed parameter of filter is changed that may led to high loss of demodulation and easy to unlock.This paper presents a digital demodulation method which can avoid the shortcoming of anaglog circuit and improve the reliability of the product. The key technologies are digital carrier tracking, auto gain control and early-late bit synchronization. This method is suitable for the implementation of the project using the FPGA. It has the advantages of low demodulation loss, saving resources, easy realization and high reliability.