Abstract:Objective To evaluate the effects of Moutan cortex and Paeoniae rubra radix on coagulation and potential casual ingredients. Methods Platelet aggregation was determined by turbidimetric method. Thrombolytic rate and the rate of whole blood clot were determined by gravity method. The content of each plant was determined by HPLC. Results The maximum platelet aggregation rate of rabbits in the control group was 42.62%, and the plasma thrombin time was 13.45?s. After different drug solutions, the maximum aggregation rate of platelets decreased (P?0.05), and plasma thrombin time increased (P?0.05); combined decoction group had the best efficacy, the platelet aggregation rate was 20.77%, and the thrombin time is 21.01?s. Within 24?h, the thrombolytic rate and the whole blood clot dissolution rate of the two medicines combined frying and single frying then combining were higher than that of single fried Moutan cortex and single fried Paeoniae rubra radix.The results of HPLC analysis showed that the content of paeoniflorin increased (P?0.05) and the content of gallic acid was almost the same after the two medicines were combined with single frying, the difference was not statistically significant (P?>?0.05). Conclusions Joint application of Moutan cortex and Paeoniae rubra radix exerts better anti-coagulation effect by enhancing dissolution of casual ingredients, which has rational compatibility, and provides scientific basis for clinical rational drug use.