Aimed at the fact of finite element method (FEM) building of rifled barrel relying on the professional software Hypermesh, the combination FEM model building scheme based on ABAQUS and Matlab software was proposed, and the FEM building flow process of rifled barrel with initial bend was researched. Based on Von Misses yield criterion and Johnson-cook plastic strengthen criterion, the projectile-barrel coupling model considering bearing band with elastic-plastics and rifled barrel with initial bend was built, and the movement of projectile in barrel was analyzed, the result shows that: considering the barrel self weight bend, the function of projectile-barrel coupling became serious, and both level and vertical orientation were effect by the bend of barrel.