Abstract: Objective: To investigate the effects of dezocine analgesia on the incidence of the postoperative delirium in orthopedic elderly patients.Methods: Seventy more than 60 years old patients,who were scheduled by knee and hip arthroplasty were randomly into the dezocine analgesia group(DA group) and morphine analgesia group(MA group)(35 cases each group).The incidence of the postoperative delirium,visual analog scale(VAS) and adverse reactions between two groups were compared after operation(T1),and at 24 and 48 hours after operation(T2 and T3).Results: The difference of the incidence of delirium at T1 between two groups was not statistically significant(P>0.05).The differences of the incidences of nausea,vomiting and respiratory depression after operation between two groups were not statistically significant(P>0.05).The differences of the VAS scores at T1,T2 and T3 between two groups were not statistically significant(P>0.05).Conclusions: The effects of dezocine analgesia on the incidence of the postoperative delirium in orthopedic elderly patients are the same as that of morphine,which are less risks and adverse reactions.