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The early distributed test system mostly adopts the trigger mode based on hardware connection line, which has the advantages of high security and fast speed, and is suitable for the test system with more centralized devices at each node. In order to make the distributed test system free from cables and test objects with a larger range and more dispersed locations, a wireless link based trigger system solution is proposed. A wireless transmission link is designed, including all modules from instruction information generation to its receiving. It can support two different trigger modes -- timing trigger and random trigger, and it can support both “one-to-one” and “one-to-all” instruction transmission. The software radio combination of USRP and LabVIEW is used to verify the functions and performance of the proposed system. Function tests show that, the “one-to-one” and “one-to-all” instruction transmission under timing trigger mode and random trigger mode can be successfully transmitted and received. In the performance evaluation, delay is considered, and the test results show that, the delay over the whole link is around milliseconds under the test environment of software radio combination of USRP+LabVIEW, and the specific delay value relies on the link parameters.