Natural gas hydrate is an environmentally friendly and efficient new energy source. Drilling core is the most direct way to identify gas hydrates. The impact tube shoe is located at the lowermost end of the drilling coring device, and works together with the impact tube. In the coring process, the impact tube shoe is a key part to ensure that the coring work can be carried out smoothly. This paper uses ANSYS VVorkbench18.0 finite element analysis software to optimize the size of the impact tube shoes. The optimization content includes: The length of the cutting surface along the axial direction 1, angle of front angle a, combination optimization of axial length 11 and angle of front angle a, and the thickness 6 of the end face. This paper explores the variation of the maximum stress and penetration resistance of the impact tube shoes when the shoes of different sizes penetrate into the mudstone layer. According to the calculation results, the optimized shoe size: l=35mm, alpha=20 degrees, l(1)=13mm, and delta=1.5mm. The optimized shoe model not only has the sufficient strength, but also exhibits good penetration performance, and smaller penetration resistance reduces drag during coring. And the impact tube shoe could work under the load of 254.17kN, which is the load under the seabed with the water depth of 1300m.
