An online discharge measurement method meet the basic accuracy requirement was proposed after searching for the representativevertical velocity of the mean flow velocity at the gauging section of hydrometry station. And some relevant suggestions were presented for the flowmeasurement of equipment of automatic telemetering flow and finding relevant site of one point on the surface of water. We have used 918 dischargemeasurements at the Qianhancun Station of Jurong River in the Qinhuai River Basin from 1990 to 2016 in this study. The results show thatin the periods of higher， middle and lower water levels， the certainty coefficient R between mean velocity in vertical and mean velocity in crosssection at the 65m’s vertical is above 0.98， and the installation site of the automatic flow measuring device of V-ADCP is suitable at the 65m’svertical in the periods of higher， middle and lower water levels.