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为了解决组合型磁通观测器中的切换点设置对观测器及磁通型功率放大器性能的影响，提高组合型磁通观测器的观测性能，分析了组合型磁通观测器的切换点与系统参数及观测器性能之间的关系，给出了切换点最优化设计的方法。针对组合型磁通观测器的最优切换点随着系统参数的变化而改变从而造成观测器性能的下降的问题，基于模糊控制理论提出了一种切换点自适应调整方法，结合切换点最优化设计方法，对组合型磁通观测器的切换点进行实时在线的调整，提高了组合型磁通观测器的性能和磁通观测的准确度。“,”The switching point of combined flux observer had a very important influence on the performance of observer. An analysis to the relationship among the switching point, system parameters and performance of the observer was made, and the optimal design method of switching point was given. As the optimal switching point would change as the system parameters changed, it caused a decline in performance of combined flux observer. For this problem, a method of switch point self-tuning was proposed. Combined with the optimal design method of switch point, the switch point of combined flux observer could be real-time online adjusted which improved the performance and accuracy of combined flux observer.