An idea , simulating the fuzzy model by establishing the fuzzy model and fuzzy control rule of the controlled object is proposed . generally , it is difficult to acquire the accurate mathematical description of the controlled object . a dynamic modulating factor is introduced in the designing of the fuzzy controller so as to improve the precision of the fuzzy control . and a more convenient defuzzify calculation method is adopted . the cart and the single inverted pendulum are taken so as to illustrate the simulation result . in addition , the detailed qualitative analysis of the fuzzy system is achieved . a kind of common method of qualitative analysis is proposed . it can be used to analyse the fuzzy system and describe the behavior of the system state precisely in the phase plane . the simulating results illustrated the method is feasible and available 提出了在難以精確描述控制對象數學模型的情況下,通過建立控制對象的模糊模型來確定系統的模糊控制規則,并對模糊系統進行仿真分析的思想.利用連續系統定性分析的思想,提出一種對模糊系統進行定性分析的可行方法,在相平面內較為準確地刻畫模糊系統的動態行為.在模糊控制器的設計中,引入動態調節因子來提高模糊控制的精度,并采用了一種便于實際運算操作的解模糊運算方法.在一種簡單的控制對象情況下進行了具體的仿真計算,得到較理想的控制效果.此外對具有精確數學模型的一級倒立擺系統進行此種模糊控制,亦取得很好的仿真結果