The invention relates to a method and system and for testing switching network as well as a test initiation module. The method includes: in a switching network composed of an input stage, an intermediate stage and an output stage switching units, when the intermediate stage switching unit receives test packets in sequence from the test initiation module, the intermediate stage switching unit respectively transmits the test packets to the output stage switching unit connected to the intermediate stage switching unit; and the intermediate stage switching unit transmits the test packets to the test initiation module for processing upon receiving the test packets through the input stage switching unit connected to the intermediate stage switching unit. The test initiation module includes a test packet producing sub-module and a process sub-module. The system includes a test initiation module and at least a switching network, wherein the test initiation module is connected to the switchingnetwork for producing a plurality of test packets for indicating the switching network to complete the inventive test method. The invention adopting a technique approach taking the intermediate stageswitching unit as a reference to traverse all chain circuits in the switching network, thereby only a test initiation module will complete the test work, which has simple test scheme and low cost.