It gathers parking grade by using SCA61T sensor, and the grade information is transmitted to center ECU by CAN bus real time. As a result, the electric parking system can control parking strength real time. The result indicates that using the method, parking vehicle can be brought suitable restrict strength when the vehicle on different grades. It can make electric parking system be more economy and energy saving with the method. And the application life can be extended through decreasing wear and tear of brake mechanism’s accessories and components.