Based on electromagnetic theory and mechanical dynamics, a calculation model for the working process of electronically-controlled gasoline injector is established to analyze the coupled relationship between its dy-namic response characteristics and the structural parameters of magnetic circuit. With minimizing the opening and closing time delays as objectives, the structural parameters of magnetic circuit is optimized by using multi-objective simulated annealing algorithm, and a simulation on the magnetic field line, magnetic induction intensity, electro-magnetic force and dynamic response characteristics before and after optimization is conducted and verified by tests. The results show that the dynamic response characteristics of electronic fuel injector are obviously improved after op-timization.%依据电磁学和机械动力学理论，建立了电控汽油喷油器工作过程的计算模型，以分析其动态响应特性与磁路结构参数之间的耦合关系。以缩短电控汽油喷射器开启和关闭延迟时间为优化目标，利用多目标模拟退火算法对磁路结构参数进行了优化。采用 Ansoft Maxwell 电磁场仿真软件，对优化前后的磁力线、磁感应强度、电磁力和动态响应特性进行了仿真分析，并通过试验对优化结果进行了验证。结果表明，优化后的电控汽油喷射器的动态响应特性得到了明显的提高。
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