In　order　to　develop　the　correlations　of　the　fin　performances　of　the　catalyst　filled　plate　fin　heat　exchanger　(CFPFHE)　for　hydrogen　liquefaction,　a　numerical　model　of　the　plain　fin　filled　with　catalyst　at　30–80　K　is　established.　The　effects　of　temperature,　the　structural　parameters　of　the　fin　and　catalyst　layer　and　the　operating　condition　on　the　fin　performances　of　the　fin　channel　are　analyzed　and　discussed.　The　results　show　that　the　temperature　distribution　patterns　and　fin　performances　at　30–40　K　and　above　40　K　have　obvious　differences.　The　results　above　40　K　can　be　characterized　by　that　at　70–80　K.　The　sensitivity　analysis　shows　that　the　distributions　of　sensitivity　at　70–80　K　and　30–40　K　are　similar.　The　heat　transfer　and　ortho-para　hydrogen　conversion　performances　are　mainly　affected　by　the　structural　parameters　of　the　fin　and　the　operating　condition,　while　the　flow　performance　is　mainly　affected　by　the　structural　parameters　of　the　catalyst　layer.　The　correlations　of　the　flow　and　heat　transfer　performances　at　70–80　K　and　30–40　K　are　obtained　by　fitting　the　data　points　on　the　response　surface　with　more　than　97%　of　the　fitting　degrees　and　within　±15%　of　the　deviations.　Meanwhile,　the　correlations　of　the　ortho-para　hydrogen　conversion　performance　show　that　the　mass　space　velocities　at　70–80　K　and　30–40　K　should　be　lower　than　1.25　and　7.50　kg　m−3　s−1　respectively　to　reach　the　standard　of　the　ortho-para　hydrogen　conversion.　The　correlations　of　the　fin　performances　can　be　used　as　the　basis　of　optimization　design　of　the　CFPFHE.　©　2022　Hydrogen　Energy　Publications　LLC