This paper made an analysis of the advantages and disadvantages of various communication modes of current domestic hydrological telemetry system， and made an introduction to the application of the Beicdou Satellite telecommunication in the flodwarning system for Quanzhou City,including systematic construction，netting framework，function realization,constiution of hardwaresystem and equipment selection. It will provide suggestions and experience for other regions to set up Beidou Satellie System inwater conservancy and flood prevention.