In recent years,with the continuous development of science and technology,a large number of railways have been built in our country.Due to various considerations such as geographical factors and land use restrictions,bridges are often needed to be built in the process of railway construction.Railway bridge is an important content in the process of railway engineering construction.The quality of railway bridge will have a direct impact on comfort and safety of the train running.In the process of railway bridge engineering construction,the dynamic situation of railway bridge under trainload should be analyzed in detail to improve the overall quality.