Abstract：Objective The pore characteristics and mechanical properties of solid and sheet Triply Periodic Minimal Surface(TPMS) structures were compared and studied. Methods Construct solid TPMS and sheet TPMS models of D, G, and P units with the same porosity, and compare the pore characteristics of the model such as pore diameter, rod diameter, and specific surface area; The mechanical properties of the model were analyzed by finite element method, porous titanium samples were made by additive manufacturing technology, the pore characteristics of porous titanium were observed by microscope and scanning electron microscope, and the mechanical properties of porous titanium were detected by compression test. Results The CAD model shows that the specific surface area of the sheet structure of the same unit is significantly higher than that of the solid structure; The results of finite element analysis and porous titanium compression experiment show that the mechanical properties of the sheet structure of the same unit are significantly better than those of the solid structure. Among them, the D unit sheet TPMS model has the most significant advantages, the specific surface area of 13.00 mm-1. And the elastic modulus, yield strength and compressive strength of the titanium sample are 5.65±0.08GPa, 181.03±1.30MPa and 239.83±0.45MPa, respectively, which are 43.87%, 55.08% and 67.21% higher than the solid porous titanium sample. Conclusions The sheet TPMS model of the same unit has a larger specific surface area, which is more conducive to cell adhesion and growth, and its low stiffness and high strength mechanical properties effectively reduce stress shielding and provide sufficient mechanical support. It is an ideal pore structure model for bone defect repair substitutes.