For internal implants such as stapler titanium nails,the first step of infection is the adhesion of bacteria on the surface of the material.Improving surface hydrophobicity is an effective way to reduce bacterial adhesion.Based on bionics and finite element simulation technology,a square column texture was machined on the surface of the stapler titanium nail,and a droplet spreading model on the textured surface was established.The commercial CFD software ANSYS Fluent was used to study the effect of the texture width,spacing and height on the contact angle.The influence of texture parameters on the hydrophobic properties of the titanium nail surface was analyzed.The simulation results show that,within a given range of texture parameters,the square column texture on the surface of the staples effectively improves the surface hydrophobicity.The width and spacing of the texture have a significant impact on the contact angle,and the contact angle increases first and then decreases with the increase of the texture width and spacing.The optimal hydrophobic structure is that the width is slightly smaller than the spacing,and the influence of height on the contact angle is almost negligible.With the increase of the texture height,the hydrophobicity increases slightly.