Heat　transfer　in　coal　pressurized　gasifier　convection　cooling　section　with　the　membrane　spiral　tubes　under　high　pressure　is　experimentally　investigated.　High　pressure　single　gas　(He　or　N2)　and　mixture　gas(He+N2)　serve　as　the　test　media,　and　the　test　pressure　for　each　gas　varies　from　0.5　MPa　to　3.5　MPa.　The　results　show　that　the　gas　composition,　flow　forms,　especially　the　working　pressure　affect　the　high　pressure　gas　convective　heat　transfer　coefficient.　The　average　convective　heat　transfer　coefficients　for　different　kinds　of　high　pressure　gas　in　annular　channel　heat　exchanger,　and　the　correlations　of　the　typical　flow　forms　and　its　applicable　condition　are　systematically　obtained.