The composting experiment was conducted to study the effects of adding different microorganism agents on the dynamics of nitrogen(N),phosphorus（P）,potassium（K）during composting process and the compost quality using tomato straw mixed with manure and corn straw.The results showed that addition of inoculating microorganisms can shorten composting time to 25 days,and promote the preservation of nitrogen,phosphorus and potassium.The temperature could reach to highest as 52.7 ℃ and germination index of cabbage seeds in compost could be up to 115% when added with M1 microorganism agents（mildew,actinomycetes and yeast）to the compost. Compared with the control, adding M1 microorganism agents to the compost could decrease the nitrogen loss rate by 27.7%,and promote the available phosphorus and available potassium by 126% and 105%,respectively.