Considering nonlinearity , time-varying and time-lag of temperature control system in methanol syn-thetic reactor , and the poor adaptive ability and robustness , large volume and high cost as well as poor compat-ibility in PLC-based PID control , having neural network combined with PID control was proposed to design ARM9-based temperature control system for the methanol synthesis reactor , including the system ’ s hardware and software and the model established with Simulink .The simulation result shows that ARM 9-based neural network PID controller has better stable and dynamic characteristics , and the system has strong robustness and anti-interference .%针对甲醇合成塔温度控制具有非线性、时变性、时滞性，以及基于PLC的PID控制自适应能力差、鲁棒性不强、控制器体积大、成本高及兼容性差等问题，将神经网络与PID控制相结合，设计基于ARM9的甲醇合成温度控制系统，给出了系统的软、硬件结构。 Simulink仿真结果表明：基于ARM9的神经网络PID控制器具有较好的系统稳态与动态特性，系统抗干扰能力强，鲁棒性也比较好。
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