Based on the basic principle of the wireless sensor network， a new-type ZigBee wireless self-network communication platform is applied in the online transmission line joints temperature monitoring system. A description is made of the hardware and software structure and an account is given of the scheme and algorithm for aggregated networking for the joints temperature monitoring nodes based on ZigBee technology. A method is proposed for realizing reliable， energy-saving and highly efficient data transmission. Test results show the unique application superiority of the ZigBee technology in terms of self-association， dynamic network topology， large network capacity， and data-centralized transmission in power equipment online monitoring.