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An on-line monitoring system of temperature of conductors and fittings based on GSM SMS and Zigbee is produced in this paper, by which the temperature of conductors and fittings can be monitored in real-time and some accidents caused by the increased temperature can be avoided. The principle and the feature of GSM SMS and Zigbee communication are analyzed. The work principle of DS18B20 is illustrated. The construction of this system is outlined, and the force modal of calculating the variety of the sag due to the increased temperature of conductors is built. The Zigbee communication module is produced based on MC1319X and MC9S08. Finally, the software and hardware design of the online temperature monitoring unit of conductors and fittings are outlined.