The article firstly discusses the intension of evaluating the urban bridge risks,gives some thinks of the urban bridge risk evaluation to the people through analyzing t.

The bridge ship collision the risk assessment is involves the hydrology, the port navigation, the risk, the bridge and so on many domain interdisciplinary studies.

The paper analyses the present situation of the bridge insurance in China and puts forward the necessity of implementation insurance.

In this paper, main wind disaster of bridges in the world from 1818 to now are pointed out.

Combined with known static and dynamic characteristics of wind in structural wind engineering,the article studies the main forms of static and dynamic response of bridge structure under the action of wind,and introduces main research objects and works of bridge\'s wind-resistant design,which to offer theoretical basis for studies on wind engineering of bridge in the 21st century.