The　ion　current　rectification　(ICR)　phenomenon　is　well　known　due　to　the　diode-like　response　behavior　that　attracts　increasing　research　interest.　However,　most　studies　focus　on　the　single　channel　with　fixed　surface　charge,　and　the　dependent　ion　transport　behavior　in　highly　coupled　solution-surface-membrane　has　not　been　fully　studied　so　far.　Herein,　a　coupled　ion　transport　model　in　the　SiO2/Al2O3　membrane　channel　is　proposed　to　investigate　the　asymmetric　response　behavior.　The　results　show　that　SiO2　and　Al2O3　membrane　enable　the　negative　and　positive　surface　charge　that　forms　a　heterojunction　channel.　This　leads　to　significant　ion　rectification　due　to　the　asymmetrical　surface　charge　property.　Besides,　the　surface　property　of　the　membrane　is　highly　regulated　by　solution　pH　and　the　acidic　environment　is　more　conducive　to　the　enhancement　of　asymmetric　ion　transport.　Further　study　shows　that　the　best　heterojunction　ratio　is　1:1　of　the　lengths　of　negative　charge　regions　to　that　of　positive　charge　regions.　The　research　results　provide　valuable　information　on　ion　transport　and　nanofluidic　devices.　©　2024