With　the　rapid　development　of　internet,　virtual　community　has　become　the　most　import　knowledge　sharing　platform.　And　this　study　investigates　the　inter-relationships　among　virtual　community　culture,　group　cohesion　and　knowledge　sharing.　Based　on　185　questionnaires　from　Chinese　netizens　in　professional　virtual　community,　this　paper　implements　a　structural　equation　model　to　test　the　research　framework　and　hypotheses.　The　results　show　that　virtual　community　culture　has　direct　positive　impact　on　group　cohesion　but　no　direct　positive　impact　on　knowledge　sharing.　In　addition,　group　cohesion　plays　an　intermediary　role　between　virtual　community　culture　and　knowledge　sharing,　and　has　direct　positive　impact　on　knowledge　sharing,　which　indicates　that　group　cohesion　is　very　important　to　Chinese　netizens　for　knowledge　sharing　activity　under　the　rapid　changed　environment　of　knowledge　economy.　©　2008　IEEE.