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D visualization temperature online monitoring system is introduced. In order to display the overall temperature information of low-temperature vacuum spherical tank and improve the efficiency of test monitoring,temperature sensors are installed in the inner wall of outer tank,the outer wall of inner tank,sandwich,vertical bracket and other parts of the vacuum tank. Temperature signal is acquired real-time through LabVIEW data acquisition card,3D model and mesh map of spherical tank is established in Pro-E and is imported into the LabVIEW environment. Temperature signal value is mapped into the model by spatial interpolation algorithm. The overall temperature field distribution information of vacuum tank can display intuitively. At the same time,a variety of functions are developed by the subprogram of increasing scene object ,creating clip plane and setting drawstyle,such as model hiding,partition,perspective and picking up sensor points and so on. Adopting the method of 3D visualization,the integrity and correlation of model displaying is increased,the efficiency of data analysis is improved,the goals is accomplished for real-time monitoring of low temperature vacuum tank. The online monitoring system has been accepted and put into use. Excellent overall performance,especially a visual and novel 3D visualization interface has been praised by operators. 