The　O-ring　made　of　nitrile　rubber　(NBR)　is　widely　used　in　high-pressure　hydrogen　storage　systems　due　to　its　excellent　sealing　characteristics.　The　sealing　performance　of　the　O-ring　is　directly　related　to　the　safety　of　the　high-pressure　hydrogen　storage　system.　The　stress　and　strain　at　the　sealing　interface　are　key　factors　in　evaluating　the　sealing　performance.　Under　extreme　conditions,　excessive　stress　and　strain　is　also　the　reason　for　the　failure　of　rubber　materials.　Prolonged　exposure　to　high-pressure　hydrogen　gas　can　cause　hydrogen　permeation　in　O-rings,　altering　the　stress　distribution　at　the　sealing　interface.　The　paper　establishes　an　analytical　function　model　based　on　the　modified　hyperelastic　effective　modulus　for　the　distribution　of　hydrogen　pressure　and　stress　on　the　sealing　surface,　revealing　the　stress　extremum　and　stress　distribution　at　the　sealing　interface　under　hydrogen　permeation　of　the　sealing　ring.　The　paper　proposes　the　influence　of　hydrogen　concentration　on　hydrogen-induced　strain　in　O-rings,　refining　the　composition　of　strain　in　O-rings　under　hydrogen　permeation.　By　comparing　the　analytical　model　with　the　simulation　model,　the　correctness　and　effectiveness　of　the　analytical　model　were　validated,　while　the　accuracy　of　the　simulation　model　was　verified　through　experimental　data　from　Kyushu　University　in　Japan.　The　paper　proposes　two　indices,　S-hpsd　(Skewness　Coefficient　of　Hydrogen　Permeation　Stress　Distribution)　and　K-hpsd　(Kurtosis　Coefficient　of　Hydrogen　Permeation　Stress　Distribution),　to　describe　the　stress　distribution　at　the　sealing　interface　in　Hydrogen　Permeation　environments.　The　results　indicate　that　under　the　same　compression　ratio,　the　higher　the　hydrogen　pressure　within　0　MPa–70　MPa,　the　greater　the　normal　stress　at　the　sealing　interface.　The　stress　distribution　at　the　sealing　interface　changes　from　U-shaped　to　V-shaped,　with　both　S-hpsd　and　K-hpsd　gradually　increasing.　The　kurtosis　coefficient　of　hydrogen　permeation　stress　distribution　increases　significantly.　Under　the　same　hydrogen　pressure,　within　the　range　of　8%–20%,　the　higher　the　compression　ratio,　the　higher　the　normal　stress　at　the　sealing　interface.　As　the　shape　changes　from　U-type　to　V-type,　both　S-hpsd　and　K-hpsd　gradually　decrease.　The　research　findings　of　this　study　can　provide　references　and　theoretical　support　for　maintenance　strategies　and　failure　prevention　of　O-ring　seals　in　hydrogen　fuel　cell　vehicles.　©　2025