The special software for computer-aided systems to test spacecrafts is shortly described. The test system is a multi computer software-hardware complex. The test procedure is represented as a computer program written in the special-purpose language “Dipol”. The language has the necessary concepts and means to tie the test process to the real time. In a test process the Dipol statements undergo the interpretation, proper commands are issued to the devices to test, due parameters are measured, and the test results are displayed for the operator in easy-to-percept form. The operator possesses the necessary means to control the test process. All events arising in the course of testing are registered in the log of testing. The system was used successfully in preparing and launch of the manned unit of the international space station, monitoring satellites “Yamal”, cargo space ships and transport space ships e. t. c.