The invention provides a method for realizing automatic test on large data impact, and a relative system, comprising that building a data report simulator, a control program according to test demand triggers the data simulator to generate data to be feedback to the control program, the control program sends data and test command to a client test tool, and sends the data from interface and controller to a match process, and reports the matched result. The invention modifies the alarm data report test process, when applied in alarm test, to improve the continuity of test and correct of matched result.