There is a great fire risk in the university student dormitory because of its intensive resident rate, the large amount of combustible materials, the complex building structures and the weak fire safety awareness of students. Major accidents always happen once it is out of control. In order to investigate the fire risk of the university student dormitory, an assessment index system including the fire-proof capacities of buildings, the fire load, the fire facilities, the fire-fighting capacities, the evacuation system and the safety management is adopted based on the characters and causes of fire in the university student dormitory. A grey relational assessment model for fire of this type is built according to the grey relational theory. In addition, the fire risk of a male student dormitory in one university in Beijing is calculated with this model and the final evaluated results show that it is in level two, which means that the dormitory is in a relatively safe state. It shows that the valuable fire risk assessment results and the relevant weak links can be obtained by this scientific grey relational method. Thus, the corresponding control and improvement measures could be put forward. They are of significance to the design of the fire protection and the daily safety management for the university student dormitory.