The　development　of　Chinese　cold　storage　chain　logistics　is　relatively　backward　which　affects　the　food　industry.　Cold　store　is　the　key　part　of　cold　storage　chain.　The　flow　field　is　an　important　technological　parameter　in　cold　store.　A　three　dimensional　mathematical　model　was　established　to　study　the　flow　of　field　distribution　inside　a　cold　store.　The　results　are　testified　by　experiments.　Some　rules　are　discovered.　It　is　revealed　that　the　optimal　inlet　air　velocity　is　in　the　range　of　3-5m/s　for　a　cold　store.　The　results　will　provide　an　important　help　on　the　technical　development　of　the　cold　storage　chain　logistics　in　China.　©　2010　ASCE.