Abstract: In order to ensure that the railway track and bridge meet the requirements of strength and stability under the action of temperature and train load, the additional longitudinal forces check of Continuous Welded Rail (CWR) on the long-span bridge is indispensable. Aiming at the difficulty and time-consuming to develop the calculation model of additional longitudinal forces of CWR on bridge and the model has insufficient versatility, according to the bridgetrack interaction theory of CWR on bridge, based on Windows system, using VB.net and ANSYS APDL secondary development language, this paper developed the calculation software of additional longitudinal forces of CWR on bridge. The software has a perfect pre- and post-processing module. The pre-processing module can implement the input of various bridge span combinations and other parameters. The kernel adopted the bridge-track interaction finite element calculation program. The post-processing module can implement data visualization and automatic output of calculation reports. The software is easy operation and has friendly interface and powerful functions. Taking 60 m + 100 m + 60 m continuous beam as an example, the additional longitudinal force of CWR was calculated and the results were compared. The error of the results was within 2.12%, which verified the correctness of the software.