Research purposes: With increasingly speeding up the pace of urbanization in China and increasing the rgent demand of traffic construction in the super － major cities，the more and more urban bridges are built． Although most of them are good in the safety and stability and can meet the functional requirement，but a few of them are severely damaged，resulting in fracture and collapse to bring about the unfavorable effects on the urban traffic system，people＇s normal life and public opinions． In this paper，the experiences and the common issues for caution in the bridge design and investigation are summarized for providing the reference to the similar works．
Research conclusions: Based on the experiences and learning lessons about the bridge construction，the following proposals are made: ( 1) The bridge＇s design load bearing capacity should increase to make sure the bridge can stand up to the vehicles with the one － side loading and overloading． ( 2) The anti － dumping structure should be used to avoid the big careless omissions and defects． ( 3) The water － proof，draining and anti － seismic functions of the bridge should be improved to make the bridge more durable and more suitable for use．
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