在windows XP操作系统下，使用Labview开发了数字调制解调系统。该系统使用虚拟仪器技术解决了传统实验教学中使用传统仪器投资大、通途单一、维护困难等缺陷，具有界面友好，维护简单等优点。文中详细阐明了数字调制解调系统的设计过程，并给出了仿真结果，为改善大学通信类、电工类教学提出一种新的方法。-In windows XP operating system, developed using Labview digital modulation and demodulation system. The system uses virtual instrument technology to solve the traditional experimental teaching traditional instruments used in investment, a single thoroughfare, maintenance difficulties and other defects, with a friendly interface and simple maintenance. This paper elaborates on digital modulation and demodulation system design process and the simulation results, to improve the university communications, electrical class teaching proposes a new approach.