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介绍了电动助力转向系统（ electric power steering，EPS）机械结构和工作原理，建立了EPS动力学模型和状态空间方程。提出了一种基于遗传算法的PID控制策略，即利用遗传算法强大的寻优能力，对PID控制器参数进行优化，使PID控制器达到更好的控制效果。通过Matlab/Simulink仿真分析，表明使用该控制策略的EPS响应迅速，输出稳定，性能得到了有效提高，为进一步的产品开发奠定了理论基础。“,”After introducing the mechanical structure and working principle of electric power steering( EPS),the EPS dynamic model and the state space equation are established. Based on this model,a PID genetic algorithm control strategy for EPS is put forward,i. e. ,use the powerful search ability of genetic algorithm to optimize the parameters of the PID controller,the PID controller can achieve a better control effect. By using Matlab/Simulink simulation and analysis,the simulation results show that the control strategy makes EPS fast response and stable output,the performance has been effectively improved. Therefore,it has laid the theoretical foundation to develop the products.