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The distributed test system is a complicated measuring and controlling system based on computer controlling technology, network communicating technology and sensor technology. Different from the independent test system, in the network distributed test system, every test device need to communicate with the gateway node according to the communicating treaty to fulfill corresponding test. Different transmission distances will lead to delay difference when the gateway node has sent signals to different test devices. The test data can not reflect the true information for the reason of clock difference unless the test devices of the system own a unified time base. So all the devices in the whole test network should keep time synchronization. In the view of the requirement of time synchronization, the delay of signal transmission in the test system is studied, and also, a time delay measuring method based on FPGA is presented. The realization principle of delay measuring method from software and hardware is expounded in detail, and the function simulation and experiment verification are carried out.