Hydrologic data processing is an important part of formating hydrological monitoring results.As the automation degree of hydrological monitoring increasing and substantial increase in the amount of hydrological data collection,a large number of data processing become a major problem in hydrologic data processing.This paper tried to use Polyline Approximation Method to process the hydrological telemetry data,so as to reduce the amount of extracted data,extract the minimum data to constitute the polyline for ...