With the development of harbor bridge construction and wide application of high-performance concrete,the cracking of concrete bridges is attracting more and more attentions.The special requirements in bridge engineering design are often put forward,such as concrete continuous casting,and this lead to a lot of high pier and large-span bridge engineering structures,so that the temperature control and crack prevention become one of the key problems in the bridge design and construction.Combining with the practice of bridge design and construction,and applying FEM simulation and visual programming technologies,this paper analyzes the temperature and stress fields of some concrete bridges,makes relatively systematical and in-depth study on the cracking mechanism and prevention measures for the bridge concretes.