The coupling principle of the ball through assembled camshaft is briefly explained,contrast to the shortages of the traditional one-piece camshaft and the emerging assembled camshaft with advantages of high material utilization,reliable connection and meeting the energy requirements of lightweight,etc is explained.Taking a certain type one-piece camshaft as prototype,the information as part position stress distribution cloud of the assembled camshaft during the ball through process,contact state between shaft tube and cam,wall thickness reduction amount of the shaft tube,cam deformation,friction influence are gained and analyzed through reasonable modeling and simulation.Finally,the experimental verification shows that the ball through assembled camshaft can meet the demand of the engine actual conditions.A certain theoretical reference basis for the design and machining of the ball through assembled camshaft is provided.