Objective To observe the effect of thalidomide combined with dexamethasone in treatment of multiple myeloma(MM).Methods According to the tolerance of patients,the dose of thalidomide was gradually increased form 100mg/d to 400mg/d.Dexamethasone was given for 15mg/d,1-4 days once a month. Results 5 of 18 cases with MM partially released,10 cases improved,and 3 cases was ineffective.The total effective rate was 83.3%(15/18).There were no side effects not to be tolerated.Conclusion Combination of the thalidomide with dexamethasone on treatment of multiple myeloma shows obvious effects.