Grid　computing　is　a　coordinating　process　for　resource　sharing　and　problem　solving　in　dynamic,　multi-institutional　virtual　organizations.　In　reality,　these　virtual　organizations　are　always　corresponding　to　some　practical　organizations.　While　on　Internet,　there　still　much　more　personal　computers　are　not　belonging　to　any　of　these　organizations.　Only　by　interconnecting　all　these　clusters　of　computers　in　a　Grid　structure,　thus　it　will　facilitate　massive　scale　resource　sharing.　One　traditional　way　is　to　interconnect　these　personal　computers　to　those　VOs　corresponding　to　the　practical　organizations.　This　presents　a　Virtual　Organization　self-organized　by　Personal　Computers,　and　these　Personal　Computers　are　interconnected　to　the　Grid　Structure　by　this　Virtual　Organization　(VO)　to　achieve　the　maximum　scale　resource　sharing.