A local adaptive fitting method for planar linkages＇ coupler curve is presented, and the segment adaptive circle and segment adaptive straight line for coupler curve with three times saddle point significance are defined. Thus, the approximate function generation of six-bar dwell linkage is converted into the local adaptive plane curve fitting. A mathematical model of the approximate functional synthesis of Stephenson HI six-bar dwell linkage is established. An optimal method is proposed for solving the six-bar dwell linkage satisfying desired accuracy, in Which the dwell and un- dwell segment are simultaneously taken into consideration. Example results show that the optimal computation is feasible.%摘要：提出了平面机构连杆曲线局部自适应拟合方法，定义了连杆曲线具有三次鞍点意义的局部自适应圆、局部自适应直线，把六杆间歇机构近似函数综合转化为平面曲线局部自适应拟合问题，建立了StephensonⅢ型六杆间歇机构近似函数综合的数学模型，给出了可同时保证输出函数间歇与非间歇部分精度要求的优化求解方法，算例表明该优化过程是可行的．
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