The utility model discloses a sealing member is closely spent to height, wherein the inboard week portion through the ring body made at flexible sealing material sets up the nanometer composite bed respectively with outside week and on encircling the diaxon side end of body, and this nanometer composite bed adoption has very compact structure by nano -material with compound formation of flexible sealing material, effectively grounding resistance separates the surface leakage that the medium passes through the sealing ring, this nanometer composite bed separation medium is to flexible sealing material internal leakage simultaneously, the sealed validity of sealing ring has been strengthened effectively.