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Ammonia (NH3) emissions and the relationships between NH3 concentration of air outlet and impact factors were investigated during the composting of swine manure mixed with sawdust and a multiple-strain culture. Composting was conducted in a laboratory with natural ventilation during the summer of 2009. The results showed that NH3 concentration first increased and then decreased. During the turning period, the NH3 concentration was up to 50ppm indicating that the turning regime influenced NH3 emission. There are significant positive correlations between NH3 concentration and the ambient temperature, composting pile temperature and odor concentration (R2=0.787, p<0.01; R2=0.383, p<0.05; R2=0.597, p<0.01, respectively). The cumulative NH3 emission factor of the entire process of composting was 3.07 gkg-1 (The composting maturity needs about 30 days under natural ventilation during summer at Hangzhou City. The mean value of daily NH3 emission rate was 0.100.07 gd-1kg (initial weight)-1. The first 3-12d, the period of largest NH3 emissions, accounted for 60% of total emissions. Accordingly, controlling NH3 emissions during main periods of composting can reduce the loss of N to achieve in-situ N management.