The　main　objective　of　this　work　is　to　propose　a　new　hydrogen　leakage　visualization　method　to　evaluate　hydrogen　jet　pressure.　A　mathematical　model　is　proposed　to　reveal　the　intensity　distribution　of　the　laser　beam　through　the　hydrogen　jet　at　different　outlet　pressures.　Our　findings　show　that　the　hydrogen　jet　can　be　regarded　as　a　gas　lens　with　adjustable　laser　beam　energy,　and　a　change　in　jet　pressure　causes　a　change　in　the　half-height　width　of　the　spectrum,　which　affects　the　intensity　distribution　of　the　laser　beam　after　it　passes　through　the　hydrogen　jet.　The　error　between　the　light　intensity　distribution　of　the　theory　and　the　light　intensity　distribution　obtained　from　the　experimental　results　is　2.59%.　The　error　is　within　the　allowable　range.　Our　technique　shows　that　the　variation　of　the　hydrogen　jet　pressure　can　be　estimated　by　analyzing　the　intensity　data　after　the　laser　passes　through　the　hydrogen　jet.　©　2023　Hydrogen　Energy　Publications　LLC