调幅技术远比调频技术及数位广播技术简单,而且,广播也是现代社会不可缺少的一部分。所以，本文使用MATLAB软件下的Simulink对调幅广播进行建模与仿真。首先，介绍该课题研究的背景、目的、意义以及工作内容等。然后，在简要介绍MATLAB及Simulink的建模环境与仿真环境的基础上，通过对AM信号的调制与解调，对调幅广播系统系进行了仿真和分析，得出具体的仿真模型，并对仿真波形进行分析说明。最后，给出结论并提出好的改进方法。针对搭建的广播系统信噪比增益非常小，为了提高发射效率，采用另外一种幅度调制方式- Modulation technology is far more than the FM technology and digital broadcasting technology is simple.Moreover, the broadcast is an indispensable part of modern society.So,This　paper use MATLAB software Simulink for the modeling and simulation of am radio.First of all, introduce the background, purpose, significance and content of the research.The brief introduction of the MATLAB and Simulink modeling environmentwith the simulation environment, on the basis of through the AM broadcast signal modulation and demodulation　the AM broadcast system is the simulation and analysis, gives a detailed simulation model and simulation waveforms are analyzed.Finally