在水文遥测自动测报系统中，采集的水文数据常常应用超短波无线通信技术进行数字传输，因此存在着进行二进制数据的调制和解调工作。本文对于目前国内水文遥测自动测报系统中常用的调制解调技术方法的实现进行了概要介绍与部分电路分析。 In the automatic hydrological telemetry system, the collected hydrological data are often transmitted by the ultra-shortwave wireless communication technology. Therefore, there is a need to modulate and demodulate the binary data. This article gives a brief introduction and partial circuit analysis of the modem modulation and demodulation techniques commonly used in the domestic hydrological telemetry automatic measurement and reporting system.