To　solve　the　problem　on　how　to　realize　mutual　authentication　between　platforms　of　different　key　schemes,　this　paper　proposed　a　mixed　cross-authentication　scheme　that　introduced　a　hybrid　certificate　and　Trusted　Validation　Authority　to　map　certificate　policies,　authenticate　certificate　chain　and　established　a　trust　relationship　between　current　TPM　based　on　RSA　and　TCM　with　ECC.　The　results　indicate　that　the　mixed　cross-authentication　scheme　is　feasible　and　can　solve　the　problem　of　compatibility.