Information　and　communication　technology　has　been　greatly　contributing　to　the　practice　of　virtual　teams.　However,　the　issues　of　information　sharing　might　affect　the　performance　of　virtual　teams　fundamentally.　To　improve　the　cooperation　among　virtual　team　members,　information　sharing　in　a　virtual　team　deserves　more　attention　from　both　researchers　and　practitioners.　In　this　paper,　the　KMRW　model　of　the　game　theory　is　adopted　to　analyze　the　existing　issues　of　information　sharing　among　team　members　and　the　causes　of　these　issues.　Based　on　the　detailed　analysis,　we　find　out　the　conditions　of　team　members　stepping　out　of　＂Prisoner＇s　Dilemma　＂.　That　is,　the　game　proceeds　under　incomplete　information　and　the　members＇　personalities　need　to　satisfy　some　specific　conditions.　Moreover,　cooperative　equilibrium　can　come　forth　as　the　Perfect　Bayesian　Equilibrium,　and　team　members　are　willing　to　share　information.　At　the　end　of　this　paper,　various　suggestions　are　provided　for　promote　the　status　of　information　sharing　among　members　in　a　virtual　team　and　improve　the　performance　of　the　virtual　team.