Abstract: The risk assessment method of multi-disaster coupled hazard was studied in view of the shortcomings in the aspect of disaster prevention for utility tunnel， and a comprehensive risk analysis on the hazards of urban utility tunnel in Baotou Xindu central district was carried out. First， the single disaster risk assessment indicators for the potential disaster in utility tunnel was set up. Then， the coupled model regarding on multi-disaster in the utility tunnel was established in order to get the coupling relationship between multiple disasters. Finally， a risk assessment method was proposed for the multi-disaster coupled hazard. The risk assessment method proposed can be used to evaluate the safety of the urban utility tunnel under various disasters， which is of great significance to policy making and comprehensive planning of urban utility tunnel.

Key words: urban utility tunnel, multi-disaster coupled, risk assessment, coupled model