Abstract: Based on the virtual instrument software LabVIEW,a multi-point precise temperature control system was designed.The accurate temperature measurement and PID temperature control program written by LabVIEW software combined with hardware such as network data acquisition card and solid state relay,it can realize precise temperature measurement and temperature control of the heating device.The temperature measurement accuracy of the B-type thermocouple used in the system can reach 0.1℃.In the high temperature range of 800~1 800℃,the system can stabilize the temperature fluctuation within±0.5℃ for a long time.The star-shaped LAN can expand the designed temperature control system to 4 047 temperature measurement nodes and 2 024 temperature control nodes,becoming a large temperature measurement and t temperature control system.