Abstract: In order to realize the safety service of the railway bridge influenced by mining，the probability integral method was used to predict the movement and deformation values of the Sanlian railway bridge at the S₂S₇ working face during mining.Based on this，the effect of subsidence，inclination and horizontal deformation on structure of railway bridge was analyzed.The results showed that the wetted cross section height under the railway bridge is in accord with the requirement of criterion，the longitudinal inclination of the bridge beam did not influence the driving，and the horizontal inclination met the requirement of the criterion by adjusting the orbit plane，so it cannot influence the stability of the bridge pier.The longitudinal compression of the bridge did not affect the use，but the tensile deformation of the bridge lateral basis reached Class III，resulting that the bridge foundation may suffer the great damage.In view of this，the design which adopted the flat steel to strengthen the bridge pier and abutment was proposed，and the safety measures for the normal service of the bridge were put forward.The practice showed that the strengthened railway bridge can bear the mining influence of S₂S₇ working face，to achieve the safety coal mining under railway bridge.

Key words: Mining influence, Bridge pier, Bridge abutment, Movement and deformation, Maintenance, Strengthening