In　this　paper,　we　study　the　quasineutral　limit　and　asymptotic　behaviors　for　the　quantum　Navier-Stokes-Possion　equation.　We　apply　a　formal　expansion　according　to　Debye　length　and　derive　the　neutral　incompressible　Navier-Stokes　equation.　To　establish　this　limit　mathematically　rigorously,　we　derive　uniform　(in　Debye　length)　estimates　for　the　remainders,　for　well　prepared　initial　data.　It　is　demonstrated　that　the　quantum　effect　do　play　important　roles　in　the　estimates　and　the　norm　introduced　depends　on　the　Planck　constant　h　＞　0.