Purpose: to improve the fuel economy of vehicles with MB-CVT, a control algorithm based on sliding mode extremum seeking (SMES) theory and an integrated control method based on combination of SMES control and traditional clamping force control were put forward. Method: designed the integrated control system based on a combination of SMES control and traditional hydraulic control, and established a mathematical model with nonlinearity and discreteness; analyzed the special curvilinear relationship between the efficiency of continuously variable transmission (CVT) and slip ratio of metal band (MB); tested the clamping force ratio coefficient of drive/driven wheel, and achieved the design for speed ratio tracking controller and changed ratio flow; completed the SMES controller design based on principle of the SMES algorithm, and carried out whole vehicle testing in the running drum tester with environment chamber. Conclusion: the test results show that fuel consumption for vehicle with MB-CVT which adopts the integrated control is 7.18L/100km, 5.64% lower than fuel consumption of traditional control system, and inverse indicator for pressure safety index of both the drive wheel and driven wheel is lower than 1, which meets the reliability, stability and optimal performance for improvement of whole-vehicle fuel economy.