Based on the agricultural production situation in Beijing，the representative chicken manure，flammulinavelutipes mushroom residual and peach branch around Beijing were selected as the research objects ofcomposting，aerobic composting using laboratory composting simulation device was carried out to study the ammonia emission from composting andits regularity.The results showedthat，the content of compost moisture increased from 50% to60%，and the nitrogen lossrate increased by about10%，the reduction ratio of ammonia emission per unit mass compost was positively correlated withthe addition ratio of peachbranches.It is suggested that the ratio of chicken manure to peach branches should be controlledat 1∶2.5 and the content of moisture should be controlled at 50%～ 60% in order to reduce ammonia emission and nitrogenloss duringcomposting.