The drive shaft spline shaft machining process was improved,the process was shortened effectively,the process benchmark was unified.Heating quenching method was put forward,the original strength of two fork ear root of spline shaft fork was kept,the deformation of heat treatment was solved effectively.The equipment for milling end face and drilling center holes was designed,the error caused by benchmark conversion was eliminated,the machining accuracy was ensured.The broaching spline process and fixture were improved,the processing efficiency was improved,positioning was more accurate,the spline shaft quality was ensured better after processing.The production efficiency was improved,the cost was reduced by improving the spline shaft fork manufacturing technology.