Abstract: Through the investigation of automobile anti-lock brake systems(ABS), the controller suitable for hydraulic brake systems is developed with the threshold control method. A proto-type controller has been manufactured and tested on the test-bed. The test result shows that the ABS controller with 80C196KC single chip microcomputer as its key unit can meet the demands of anti- lock brake control, the design of its hardware and software is correct, the determination and processing way of input signals is proper, and the choice of control logic is basically reasonable.