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The running conditions of antilock brake system (ABS) should be simulated for ABS bench test. This paper studied the simulation method of the braking running conditions of ABS on testing bench, designed the simulation interface and set running conditions. According to the wheel speed curves under various road surfaces and different vehicle speeds, the simulation running conditions of wheel speed ABS bench test need were constructed by the interface. In order to provide essential running condition for ABS bench test in various running conditions, the wheel speed signals simulation device was used to drive servo motor which rotates gear rings to produce the set wheel speed signals. The well running of ABS testing bench and the practical bench testing result of ABS obviously shows that the simulation wheel speed signals are applicable to bench test, and the simulation running conditions meet the requirements of bench test and the requests of intensified experimentation.  