High-pressure　hydrogen　direct　injection　technology　can　enable　an　internal　combustion　engine　to　attain　high　thermal　efficiency　and　discharge　clean　emissions;　hence,　the　advantages　provided　by　hydrogen　jet　impingement　are　crucial.　This　paper　presents　an　experimental　investigation　of　the　high-pressure　hydrogen　direct　injection　from　a　single-hole　cylindrical　injector.　A　test　rig　with　a　spring　set　was　designed　based　on　the　impulse　conservation　law　to　test　important　high-pressure　hydrogen　jet　impingement　parameters,　such　as　jet　impingement　force　and　impulse.　The　results　show　that　the　hydrogen　gas　jet　exhibits　a　two-zone　behavior.　In　Zone　I　(near-field　dynamic　region),　the　jet　impulse　is　not　conservative,　and　the　jet　characteristic　parameters　(jet　impingement　force　and　impulse)　fluctuate-first　decreasing　and　then　increasing.　In　Zone　II,　the　jet　impulse　is　conservative.　This　two-zone　jet　feature　is　induced　by　shockwaves　because　a　high-pressure　hydrogen　jet　with　a　high　nozzle　pressure　ratio　reaches　its　sonic　speed　at　the　nozzle　outlet.　The　Mach　disk　height　is　the　inflection　point　of　these　two　zones.　Moreover,　the　hydrogen　injection　pressure　has　a　considerable　influence　on　the　gas　jet.　As　the　injection　pressure　increases,　the　hydrogen　jet　impingement　force　and　impulse　increase.　Both　jet　parameters　have　a　linearly　increasing　relationship　with　injection　pressure.