Objective:To explore the complex prescription compatibility law of the cold and hot nature of Mahuang Decoction(麻黄汤,MHD) and Maxing Shigan Decoction(麻杏石甘汤,MXSGD),both categorized formulas but with different hot/cold natures.Methods:Oxygen consumption of mice was determined among three groups:MHD,MXSGD and the control;a cold-hot pad differentiating assay was used to observe the variability of temperature tropism among the groups of mice which was treated with MHD,MXSGD,and their compositions. Meanwhile,the total anti-oxidant capability(T-AOC) activity were detected.Results:After administration of MHD, the mice showed increased oxygen consumption(P<0.01).Compared with MHD group,the remaining rate of MXSGD mice on the hot pad was found to be significantly increased with the cold-hot pad differentiating assay (P<0.05).There was no significant difference(P>0.05) among the remaining rates of MXSGD,MXSGD with high dose Gypsum Fibrosum(MXHGF) group,and MXSGD with low dose Gypsum Fibrosum(MXLGF) group mice.Compared with the MHD group,T-AOC activity of the mice in the Consensus Compositons group was significantly decreased(P=0.0494).Compared with the MXSGD group,T-AOC activity of Gypsum Fibrosum (GF) group was increased significantly(P=0.0013).Conclusions:The differences in cold and hot nature could be represented objectively between MHD with a hot nature and MXSGD with a cold nature.The reason may be the Gypsum Fibrosum which decreased the efficacy of the consensus compositions.However,increasing or decreasing the dose of Gypsum Fibrosum will not change the cold and hot nature of MXSGD. Objective: To explore the complex prescription compatibility law of the cold and hot nature of Mahuang Decoction (MHD) and Maxing Shigan Decoction, both categorized formulas but with different hot / cold natures.Methods : Oxygen consumption of mice was determined among three groups: MHD, MXSGD and the control; a cold-hot pad differentiating assay was used to observe the variability of temperature tropism among the groups of mice which was treated with MHD, MXSGD, and their compositions The total anti-oxidant capability (T-AOC) activity were detected. Results: After administration of MHD, the mice showed increased oxygen consumption (P <0.01) .Compared with MHD group, the remaining rate of MXSGD mice on the (P> 0.05) among the remaining rates of MXSGD, MXSGD with high dose Gypsum Fibrosum (MXHGF) group, and MXSGD with low dose Gypsu T-AOC activity of the mice in the Consensus Compositons group was significantly decreased (P = 0.0494). Compared with the MXSGD group, T-AOC activity of Gypsum Fibrosum (GF ) groups was increased significantly (P = 0.0013) .Conclusions: The differences in cold and hot nature could be characterized objectively between MHD with a hot nature and MXSGD with a cold nature. the reason may be the Gypsum Fibrosum which decreased the efficacy of the consensus compositions. Still, increasing or decreasing the dose of Gypsum Fibrosum will not change the cold and hot nature of MXSGD.