The　quasineutral　limit　of　the　two-fluid　Euler-Poisson　system　(one　for　ions　and　another　for　electrons)　in　a　bounded　domain　of　R-3　is　rigorously　proved　by　investigating　the　existence　and　the　stability　of　boundary　layers.　The　non-penetration　boundary　condition　for　velocities　and　Dirichlet　boundary　condition　for　electric　potential　are　considered.　(C)　2018　Elsevier　Inc.　All　rights　reserved.