Abstract: Objective To evaluate the effects of IPS e．max CAD LT ceramic crowns in posterior teeth restoration．Methods 86 teeth of 54 patienls were restored with IPS e．max CAD LT ceramic crowns．3,6 and 12 months later,the restorations were checked and evaluated according to the standards of APHA(Alnerican Public Health Association), and patient satisfaction surveys were conducted．Result 12 months later, there was only one crown lossening, while 96％ of the 86 restorations were scored A in color，shape，margin coloring and margin sealing. More than 94％ of the patients were satisfied with the treatment effects．Conclusion IPS e．max CAD LT ceramic crown is a clinically effective method for posterior tooth restoration．It is of great value in clinical application．