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Aiming at the application of interface that between platform, velocity top and measurement system, a design of Equivalent Equipment for External System based on PCI interface is put forward. In the system, FPGA is the central controller and PCI interface is used to communicate between system and computer. Not only does the system receive the order from computer, but also produce all kinds of text signal which are required by measurement system. The design depended on the high program of FPGA and the powerful flexibility of VHDL language, achieves 4 platform torgue current which is 28V、17kHz and 2voltage acquisition of +15V、+5V. The result of connected text with measurement system shows that the system can work well and every function index meet test request. 