Abstract:Basic structure and its advantages of the satellite positioning service system (CORS) established on the basis of network RTK technology have been introduced in this paper. Combing with project examples, application, feasibility and accuracy approached of SDCORS in hydrogeological surveying have been pointed out, and the steps taken to make up the precision required have been introduced in emphsis. Through application of SDCORS in Jixi water source, it is proved that good measurement achievements which fit the precision demand can be gained by using this method. Comparing with conventional method, it is realiable and has higher accuracy. Problems which should be paid more attention in surveying have been pointed out as well.