Using　root　of　trust　to　build　Trusted　Computing　Platforms　is　a　hot　spot　of　information　security　research　nowadays.　According　to　trusted　computing,　this　paper　implements　transitive　trust　in　Java　environment　and　builds　a　trusted　Java　platform.　Malicious　Java　programs　are　resisted,　and　Java　applications　are　managed　and　controlled　by　a　trusted　Java　platform　that　only　load　and　run　trustworthy　Java　programs.　©　2009　IEEE.