Functional-group-modified surface of titanium alloys was derived by self-assembly method in the high-magnetic gravity field simulated by superconductive magnet. Contact angle and surface energy of the surface were measured and calculated by a contact angle meter, and surface roughness of the polished and eroded samples was analyzed by atomic force microscopy (AFM). The contact angle test results show that the developing tendency of contact angle and surface energy of the six test surfaces for the three fluids is basically consistent. The contact angle of the surface chemically modified by -PO4H2 functional group is decreased, and its surface energy is higher in the magnet than that out of the magnet due to the high magnetic effect. The acceleration of gravity is inversely proportional to the contact angle, and proportional to the surface energy when magnetic field intensity are equal.