In order to monitor axle temperature of train in real time

a train axle temperature monitoring and alarm system based on ZigBee and cloud terminal is designed and developed.The train manager can monitor the axle temperature of the train in real time through personal computer（PC）and mobile terminal

and set the temperature threshold to prompt the alarm

so as to avoid the occurrence of danger in an emergency.The design consists of a number of terminal nodes installed on the axle and a monitoring coordinator

both of which are low-power consumption

low-cost ZigBee processor CC2530.The axle temperature data is collected by DS18 B20 high precision temperature sensor and transmitted to terminal node.When terminal node and coordinator are successfully self-organized

the data will be transmitted to the coordinator.The coordinator packages the data of multiple terminal nodes and sends it to upper PC through the serial port.Finally

the upper PC sends the data to the designated cloud terminal server and mobile terminal through the TCP protocol.The design is stable and flexible and has broad application prospect.