The　bismuth　oxide　(Bi2O3)　was　synthesized　via　chemical　route.　The　impact　of　the　synthesis　conditions,　particularly　the　concentrations　of　organic　solvent,　on　the　nano-structure　and　field　emission　characteristics　of　the　Bi2O3　were　investigated.　The　nano-structures　of　the　Bi2O3　arrays,　screen　printed　on　metal　substrate,　were　characterized　with　scanning　electron　microscopy.　The　preliminary　results　show　that　the　concentrations　of　organic　solvent　significantly　affect　the　nano-structures　and　its　field　emission　properties.　For　example,　the　array　of　well-defined　Bi2O3　nano-wire　with　tens　of　μm　long　and　50　nm　in　diameter,　synthesized　with　a　solvent　of　3　ml　oleic　acid,　3　ml　heptane,　and　10　ml　acetone,　had　a　lower　on-set　field　(2.6　V/μm)　and　a　higher　field　enhancement　factor　(2160)　than　the　other　two　Bi2O3,　which　were　prepared　in　different　concentrations　and　looked　like　bundles　of　nano-rod　resembling　＂green-beans＂　with　or　without　surface　dendritic　structures,　respectively.　©,　2014,　Science　Press.　All　right　reserved.