According to the the inconsistence of data structure and communication protocol between equipment produced by main domestic manufactures， on-line monitoring management platform is developed. It can be used to integrate on-line monitoring systems， such as icing monitoring， meteorological and windage yaw monitoring， tower inclination monitoring， conductor aeolian vibration monitoring， conductor galloping monitoring and insulator contamination monitoring， centralize the acquisition and processing of data and do the comprehensive analysis and application. The on-line monitoring management platform for UHV AC transmission line uses B/S three layers framework to realize such functions as on-line monitoring data centralized acquisition， full display， state prediction， early warning， and statistical analysis， and has be applied on the UHV AC transmission line.