To solve the problem that the transmission efficiency of continuously variable transmission system with reflux power varies in a great range, and the traditional control strategy can’t make sure that the overall system is under ideal conditions, an economy control method based on system efficiency optimization is put forward. The engine/transmission efficiency numerical model and system optimization model are built. Taking Matlab/Simulink as the platform, objective throttle position control table and objective ratio control table are obtained by solving the optimization model. Furthermore, ECE+EUDC drive cycle simulation based on the fuel economy of sample car is carried out, and the simulation results indicate that the method of system efficiency optimization make fuel consumption reduce by more than 1.5%.