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At present, it is the key to success for well control that advanced control algorithm and advanced controller are used to control the mud lifting pump of the dual-gradient drilling as one of the key technology in deepwater drilling. This paper proposes a control program for subsea mud lift pump of the dual gradient drilling system, in which FPGA is choose as the controller system and control system hardware structure is given. The A/D、D/A Timing Control are realized respectively based on VHDL language. According to characteristics of control system for subsea mud lift pump, the fuzzy PI control algorithm based on FPGA is developed, and is used to control lift pump. The experimental results show that inlet pressure of pump may be nearly maintained at a constant value by means of control system. The fuzzy PI controller based on FPGA system has good control performance. This provides a guide for the dual-gradient drilling.