The relationship between water level and discharge at the Gaobazhou station is affected by the comprehensive influence of upstreamwater conservancy project regulation, Yangtze River backwater support and poor control of station. The relationship points are scattered. Aftertesting, H-ADCP online traffic monitoring was adopted as the main method, and hydrological cable test with sequential method was taken as sup -plement, so as to basically realize the station flow process monitoring. The H-ADCP monitoring station was constructed on the main floodway torealize the on-line monitoring of the flow of the station. It is a successful example of on-line traffic monitoring for stations with complex water leveland flow rates.