Abstract:Hydrological telemetry equipment,ultrashort wave and GPRS communication technology are used to real-time monitor change process of water level in hydrological station,and to carry out water level self-recording.This paper studies the guiding role of telemetry equipment in hydrologic survey.Based on the analysis of fluctuation time difference,diachronic discharge measurement,passing time,and survey preparation time,we made survey line and survey scheme.Seizing the survey opportunity,the flood process can be detected that enhances the precision of survey data.