从卷积神经网络的发展历史开始，详细阐述了卷积神经网络的网络结构、神经元模型和训练算法。在此基础上以卷积神经网络在人脸检测和形状识别方面的应用为例，简单介绍了卷积神经网络在工程上的应用，并给出了设计思路和网络结构。(Starting from the history of the convolution neural network, the network structure, neuron model and training algorithm of the convolution neural network are elaborated in detail. On the basis of the application of convolutional neural network in face detection and shape recognition, this paper briefly introduces the application of convolution neural network in engineering, and gives the design idea and network structure.)