Abstract: The wettability between water and reducing adhesion function surface developed was investigated in this paper. The results show that the contact angles between water and surface composite or surface coated material are much bigger than that of common metal materials. The relationship between the contact angles of various materials and roughness does not conform to the rule cosθ_γ = γcosθ. The contact angles will increase when the roughness is up to certain extent. Its mechanism coincides with wetting model of rough surface and formula.