The　rapid　development　of　information　and　communication　technology　has　been　greatly　promoting　the　practice　of　virtual　teams.　However,　the　issues　of　information　sharing　between　members　have　always　existed,　which　cause　some　problems　or　even　conflicts　in　virtual　teams.　Those　affect　the　performance　of　virtual　teams　fundamentally.　To　improve　the　cooperation　of　virtual　teams,　information　sharing　between　members　in　a　virtual　team　deserves　more　attention　in　the　academic　field.　In　this　paper,　the　KMRW　model　of　the　game　theory　is　adopted　to　analyze　the　existing　issues　of　information　sharing　between　members　and　the　causes　of　these　issues.　Based　on　the　detailed　discussions,　the　study　finds　out　the　conditions　of　team　members　stepping　out　of　＇Prisoner＇s　Dilemma＇,　that　is,　the　game　occurs　under　incomplete　information　and　their　personality　need　to　satisfy　some　specific　conditions.　At　the　moment,　cooperative　equilibrium　can　come　forth　as　the　Perfect　Bayesian　Equilibrium,　thus　team　members　are　willing　to　share　information.　At　the　end　of　this　paper,　some　suggestions　are　provided　to　improve　the　status　of　information　sharing　between　members　in　a　virtual　team　and　enhance　the　performance　of　the　virtual　team.　©　2008　IEEE.