In　this　paper,　we　study　the　combined　quasi-neutral　and　zero-viscosity　limits　of　the　two-fluid　Navier-Stokes-Poisson　system　for　a　plasma　composed　of　ions　and　electrons.　By　analyzing　boundary　layer　under　physically　relevant　condition　and　utilizing　multi-scale　asymptotic　expansion　method,　we　derive　the　boundary　layer　equations　and　construct　the　approximate　solutions.　Then,　we　use　the　energy　estimate　to　give　the　linear　stability　of　the　approximate　solutions.　(C)　2022　Elsevier　Inc.　All　rights　reserved.