In order to improve the reliability and electrical energy quality of providing electricity, the generator of power system is usually operated in parallel connection. According to the system operation circumstances, synchronous generators are usually put into or withdrawn from transmission-line system of electric power. One or more synchronous generators are sometimes withdrawn or put into operation. In some cases, it is even necessary to restore arrangement in parallel operation from two parts of power system. With the aid of Type WDT-III power system comprehensive automation experiment platform developed by Mid-China Science and Technology University, the experiment research for synchronous generator quasi-synchronism is conducted in this thesis.