The paper aimed to find the optimal combination and evaluation of the interactions of antitumor effect of the curcumin (Cur) and adriamycin (ADM) in vitro.  According to the factorial design and data   characteristics, the parameter method combined with the response surface approach were used to analyze the pharmacodynamic interactions of in vitro antitumor effects of the combination of Cur and ADM at different  dosages.  The results showed that the dose-effect relationship of the combination with the ratio of ADM-Cur 1∶3 showed significant differences in comparison with either used alone.  The dose-effect curve was shift left in combination.  The combination of adriamycin (ADM, 0.693−2.132 μmol·L⁻¹) and curcumin (Cur, 2.047− 6.304 μmol·L⁻¹) with a fixed ratio (1∶3) showed a synergism.  With increasing doses of the combination, there is an additive effect.  Computer simulation showed a trend of decreasing difference between the observed and expected effects with the dose increasing in Cur from 6.304 to 16.0 μmol·L⁻¹ and ADM from 2.132 to 5.3 μmol·L⁻¹.  The response surface analysis showed the optimal combination to be Cur 18.50 μmol·L⁻¹ and ADM 3.89 μmol·L⁻¹ with a ratio of 5∶1.  This study suggests that the parameter method combined with the response surface analysis provides richer and more reasonable information, and is helpful for quantitative design of drug combination therapy and to describe the nature and degree of drug interaction.