Abstract: The effects on environment of ammonia is getting more and more seriously. according to the information of literatures, the author summarized the studies on the mechanism and predictable models for ammonia emissions.From the hiteratures,itis ohverous that there are a hots of predicting models for ammonia emission developed abroad.And the model prediicting results have some differences finally, based on the condition in China, some issues for further study on ammonia emission were discussed.