In recent years,the global positioning system(GPS) technique is rapidly developing,since it is characterized by continuity,real-time,all-weather operation with high accuracy,this technique has found extensive application in survey,positioning,navigation.MD300 sounding system is a new topograpbic survey system especially for water areas supported by GPS.In combination with the development and application of the sounding system carried out by the Jingjiang Investigation Bureau of Hydrology and Water Resources of Changjiang Water Resources Commission,the structural function and system configuration and the implementation methods of the system are presented.From the viewpoint of its practical effect of application,this sounding system has characteristics of accurate positioning,accurate water depth acquisition and high automation procedure,compared with conventional metheds.The system is an ideal river channel mapping system.%近年来，全球定位系统(GPS)技术迅猛发展，由于它具有连续、实时、高精度、全天候的特点，使其在诸如测量、定位、导航中得到广泛应用。MD300测深系统是在GPS支持下的一种全新的水域地形测量系统。结合长江委荆江水文水资源局对该系统的开发、应用，介绍了其结构功能、系统配置及实现方法，从实际运用效果看，与常规测量方法相比，该系统具有定位精确、水深采集准确、自动化程度高等特点，是理想的河道测绘系统。
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