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The bistable mechanism has a vital role in precision engineering and robotics with benefits in free friction, no backlash and saves energy. Multi-objective optimization techniques have many applications in design mechanism. NSGA-II is strengthening in quick sorting procedure and elitist methodology. This article introduces an optimization methodology for design compliant bistable mechanisms by employed non dominated sorting genetic algorithm II (NSGA-II). The method predicts the switching forces in forward and backward motion of the bistable mechanism. The program of NSGA-II was executed in Matlab combine with Abaqus to analyze the mechanism. A flowchart of processing is introduced. An example of a bistable mechanism is investigated and results are adopted by applying NSGA-II in order to verify the method.

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