Abstract:The complaint parallel four-bar mechanism is widely used in the industry of precision actuator.In order to optimize the design of the parallel four-bar mechanism,three kinds of complaint hinge were used to design the four-bar mechanism.At first,the software SolidWorks was utilized to model three different four-bar mechanisms,then the software ANSYS Workbench was used to analyze the maximum stress value.Furthermore,the way of the orthogonal experimental design was applied to get the optimal assembly of the three factors,and additional test was used to verify the feasibility of the method.Later,multiple linear regression analysis was utilized to build the mathematical model of that four factors.Last,the model and the data were used to obtain the average error which did not surpass 0.88%,so the high reliable of the model was verified.It provides some reference for analyzing complaint mechanisms by using orthogonal experimental design method and the thought of applying software SAS.