A simulation model of turbocharged gasoline engine with electronically controlled waste valve system was built with the software of GT power. Based on the condition of boost pressure changing with the waste valve opening, characteristic values of the control system were obtained. According to the change rules of exhaust back pressure under different boost pressures, the waste valve opening was calibrated on the basis of the requirements of power performance of the engine, the matching performance between the turbocharger and the gasoline engine was analyzed, and then, test verification was conducted.The results have shown that matching a small diameter turbine can ensure the engine performance at low speed condition; the electronically controlled system can realize the continuous control of boost pressure target value; and the problems of deflagration and turbocharger super speed caused by too high boost pressures can be resolved at high speed conditions.