The paper states the methodology of SRA (structural risk analysis)of Bridges. In terms of the objects of SRA, the contents and approaches of sea crossing suspension bridge SRA are defined. The risks to be controlled necessarily are concluded by the global risk analysis, and how to achieve the control is worked out by the element risk analysis. Meanwhile, the risks of the external special events and special maintenance are included in the SRA to make sure that all risks are analyzed and controlled and none of risks in the bridge life-cycle is ignored.