Gels have superior features such as high water content, materials permeability, extremely low friction, and biocompatibility, which are not found in the hard and dry materials, because these features are due to their soft and wet features. Now artificial gels have become similar to natural gels of the human body: the articular cartilage of our knee has both several MPa of mechanical strength and about 0.01 of surface frictional coefficient. Above all, we paid attention to high functionality of shape memory gel (SMG). The frictional behavior of SMG was studied. SMG has some characteristics such as shape-memory characteristics; low friction characteristics wear resistance than the conventional gels. SMG has a shape-memory characteristic by temperature responsiveness namely the temperature change. SMG is expected practical use of to medical materials and machine materials. As for the reason, a shape-memory function does not need chemical fixation, and what I can fix mechanically is given. The machine fixation enables the solvent nonuse in the burden decrease of the patient by the medical care, machine assembling and the design and the reduction of the part mark, the miniaturization of the apparatus. In this study, Implication water rate of different SMG of the composition is measured, and power by changing implication water rate reports the characteristic, and we performed the friction behavior of SMG for the purpose of the use to the underwater apparatus. We made the gel that was low friction with high strength for the practical use of SMG and evaluated it in a Young's modulus, water content ratio, a coefficient of friction quantitatively. The dynamic frictional behavior was observed with Young's modulus and compared with frictional measurement data. This result shows that surface action peculiar to soft and wet materials except the friction behavior based on a contact theory works. This friction behavior means adaptation range expansion of the gel. We developed a new device to inspect the conformity of the range. As for it, a vertical direction and rotatory direction can measure seal materials made with gel materials. As for appearing, the low friction evaluation that gel seal materials were able to be superior to in comparison with the commercial seal materials was provided as a result of in this study. New utility value of the high-performance gel is found by elucidating friction behavior of gel changing a concept of the conventional friction and believes it when it is with the clue to practical use.