Abstract: A new fire risk assessment in terms of fuzzy gravity center is put forward to make the assessment result in connection with fuzzy intervals so as to improve the traditional marking procedure by experts. At the same time, the accuracy of assessment can be guaranteed. According to the actual survey of a marketplace, a system of fire risk assessment indices is established and used to assess its fire risk. A high mark is given to it and conforms with the actuality, showing a serious fire hazard. Compared with other assessment methods, more information and higher reliability can be got by the method in terms of fuzzy gravity center. In addition, the result of index gravity centers ranking will be beneficial to fire safety management.