Combined with the engineering conditions of the hiqh grade highway and the settlement of the subgrade and pavement on the soft soil,the paper discusses the various causes of bridge beginning or end vehicle jump resulting from the form of the nonuniform settlement produced by the bridge approach.

Courses about road and bridge is highly practical.

Facing to the characteristic of huge scale,quantity and department in rail beam bridge of maintenance and management,this paper generally analyzes the problems with the data in the information and digitalisation of rail beam bridge of maintenance and management.