本文主要是利用MATLAB7.0来实现2FSK 数字调制系统解调器的设计。该设计模块包含信源调制、发送滤波器模块、信道、接受滤波器模块、解调以及信宿，并未各个模块进行相应的参数设置。在此基础上熟悉MATLAB的功能及操作，最后通过观察仿真图形进行波形分析及系统的性能评价。-This paper is to use the MATLAB7.0 to demodulator design 2FSK digital modulation system. The design module contains the source modulation, the transmit filter module, channel, receive filter module, demodulation and sink, each module does not make the appropriate parameter settings. On this basis, familiar with the MATLAB functions and operations, and finally by observing the simulation graphical waveform analysis and system performance evaluation.