Abstract: To explore a new method of controlling environment pollution from malodorous gas produced by livestock manure, several previously isolated efficient deodorizing and cellulose-decomposing microbes strains were grouped optimally as a compound microbial deodorizer; their effects on odor and compost characteristics during livestock manure composting were assessed. The dynamic changes and emissions of nitrogen and sulfur were analyzed during composting to explore the deodorizing mechanisms of the compound mix. The results showed that the compound microbial mix had outstanding deodorization capability with increased removal rates of NH₃ and H₂S to 70% and 60% respectively in the first 20 days, reduced pH, moisture content and carbon-nitrogen ratio, rapidly improved stack temperature and extended high temperature period of compost. Stack temperature of pig manure and chicken manure reached the highest value after 25 and 20 days respectively and the period above 50 ℃ was maintained for 15 and 20 days, respectively. At the end of composting microbial deodorization reduced 25.84% and 28.65% N-loss of swine and chicken manure respectively and significantly increased (P<0.05) total nitrogen (TN) and nitrate nitrogen (NO₃^--N) in composts compared with natural composts. The microbial deodorizer promoted sulfur transformation into inorganic sulfur (SO₄^2-) and significantly increased (P<0.05) the SO₄^2- content. These results suggested that microbial deodorizers were able to efficiently reduce odor, reduce nutrient losses and accelerated compost maturity of livestock manure, as well as help amelioration environmental pollution.