Based on the transmission line monitoring of the status,this paper selects the typical transmission lines of Puer power supply bureau as the carrier, and synthesizes various advanced monitoring methods and techniques, and builds the transmission line state monitoring system based on the "point, line and surface" panoramic monitoring data. Based on the monitoring data and the operation parameters of other lines, the dynamic state evaluation model of transmission line is established. Through the actual operation of the site verification, it can effectively filter out line or an important component focused inspections, enhancing the operation and maintenance of the line level.