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The structure and the mechanism for the electric park brake (EPB) were analyzed first. Then, the dynamical analysis for the executive device of EPB was done. After that, an EPB system was designed in the viewpoint of practical application. Aimed at applying or releasing braking, the electric control unit (ECU) adopted a single-chip microprocessor (SCM) named Philips 592 and the executive device, which was driven by a direct current motor that adopted a synchronous belt driven mechanism, a planetary gear mechanism with small teeth difference and a screw-driven mechanism. Lastly, the efficiency of the EPB system was validated by bench tests for a detail automotive model. The results of the bench tests showed that the static characteristic and the dynamic characteristic of the EPB met the requirement of theoretical calculation.