针对目前自动称重配料系统中采用传统PID控制的不足、系统误差不稳定、动态特性不理想，提出了一种基于神经网络PID控制的算法。该系统传递函数为 ,本文设计BP神经网络为三层，输入层4个节点,隐层为5个节点，输出层为3个节点。-For automatic weighing batching system currently used in traditional PID control deficiencies, systematic errors unstable dynamics is not ideal, we propose a neural network PID control algorithm. The system transfer function is designed in this paper BP neural network is three, four nodes in the input layer, hidden layer of five nodes, output layer 3 nodes.