Abstract: In this paper two computers system introduced.The first computer controls and displays aero-engine states. The second one samples and typewrites para-meters data of engine, monitors the important parameters and treats urgent events. Accroding to the predeterminate program, the control states and sampling data of aero-engine can be alternately or simultaneously made by the signals between two computers, so that the purpose of automation is achieved. The software and hardware of system are dealed with in detail. On the basis of the present general engine test rig in our country. The reconstruction from the old one to the automatic is very easy. The change from automatic control to handle operation （or from handle to automatic） is quickly and reliably. The system has been actually tested on our aero-engine test bed and appraised by the Aero -Industry Ministry.