Aimed at electro-hydraulic servo controlling radial piston pump, self-adapting fuzzy PID controller was designed. Simulated with computer, system responses tracking step signal were reproduced. 针对电液伺服控制径向柱塞变量泵变量机构,设计了模糊自整定PID控制器,并通过计算机仿真,再现了系统跟踪阶跃信号的系统响应。