Fault diagnosis was an important part in the processing of network system repair.PMC was a diagnosis model which was simple and easy to be understood.Through analysis of the structure of exchanged hypercube,a generalization measure of fault diagnosis for the network system was provided,called (t,k)-fault diagnosis method.By computing,it is shown that EH(s,p) is -diagnosable and conditional -diagnosable,where 1≤s≤p.The result shows that the(t,k)-diagnosability of EH(s,p) is ,which is bigger than its ordinary diagnosability s+1,and the conditional (t,k)-diagnosability is ,which is bigger than its ordinary conditional diagnosability 4s-3.Above results present the important theory basis for fault diagnosis of exchanged hypercube network.