Abstract: According to fire risk in underpass, a fire monitoring technology based on realtime feedback was presented. And the composition and principle of the realtime feedback fire monitoring system were also described. This system will be used in Tongji underpass. And its function was demonstrated. The temperature field, smoke field and fire source location will be threedimensional virtual displayed on computer screens by this system. It is expected to help staff to guide passenger evacuations and to rescue more effectively.

Key words: underpass, realtime feedback, fire monitoring