Abstract: The bogie frame is the most important bearing structure of the locomotive,and its prediction of welding deformation has important significance in ensuring manufacturing accuracy and quality.First,the database of inherent strain for bogie frame structure was established by a lot of computing and practical measure.Then the welding deformation of hexad-axled locomotive bogie frame side-beam was predicted by using software WSDP(welding structure deformation prediction),which is based on the theory of inherent strain and elastic finite element model.The results were totally consistent with experimental data,and the reliability of the database was proved.The study shows WSDP is very useful in welding deformation prediction of large and complex structures.