For the large deep blind hole forgings of ultra-high strength steel, a single reduction rate and continuous 45° turning process is adopted in the mandrel drawing process, and the solid forging penetration and overall uniformity of the forgings head are poor. Therefore, the relationship between the deformation angle of head and tail and the reduction rate was determined by DEFORM-3D finite element simulation and analysis, and the comparative experiments of different combinations for the reduction rate (8%, 10%) and the new turning process (45°, 60°) were formulated. Results show that the combination process of the reduction rate of 10% and the turning process of 60° improves the forging penetration efficiency and the deformation uniformity of the forgings head, while the combination process of the reduction rate of 8% and the turning process of 45° effectively controls the distortion rate of inner hole in the tail and ensures the uniformity of deformation. Based on this, the rational design of head taper makes the deformation amount of head reach the same level as that of tail, further improves the forging penetration efficiency of head and completes the near-end-forming. Thus, the research results are applied and verified in the industrial trial production, and the performance uniformity of head and tail for the large deep blind hole forgings formed by the new process is significantly improved.