In this paper, considering of matter gravitation, an improved equivalent circuit of single-freedom-dimension vibrating system has been put f orward, and applied to man-machine interface problem of farming machine. This paper also gives out a way to solve the man-machine interface problem for the s teady feature of sucessive vibration and the transient response to impulsion in the point of view of pure circuit theory.%对由弹簧-阻尼器-物体构成的单自由度振动系统的等值电路模型提出了改进，追加考虑了物体重力在电路中的等值。并把改进电路模型应用于多级单自由度振动系统串联的农机人机工程，最后给出了该等值电路对连续振动的稳态响应特性和对冲击振动的暂态响应的电路求解方法。
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