In order to explore the effects of ethanedioic acid supplementation on ammonia emission reduction and nitrogen retention in composting process，a 25-day fermentation experiment with strip composting was conducted，chicken manure，corn straw and vegetable waste were used as fermentation materials.Ethanedioic acid was added in the form of initial one-time addition(EA1)and multiple spraying additions(EA2)during the composting process，and the addition amount was 0.15 mol·kg.1(fresh weight).The results showed that the addition of ethanedioic acid suppressed the temperature rise in the early stage of composting，but increased the number of days with high temperature above 50℃.The ammonia volatilization rate showed a trend of increasing first and then decreasing in all treatments.The ammonia volatilization rate was 173.93，87.29 and 64.38 g·d.1·m.2 in CK，EA1 and EA2 treatment，respectively.Compared with the CK treatment，EA1 and EA2 treatments reduced the cumulative ammonia volatilization by 49.81% and 62.99%，respectively.During the composting process，the total nitrogen content showed a gradually increasing trend，and the organic carbon content showed a gradually decreasing trend in all treatments.The addition of ethanedioic acid increased the content of total nitrogen and organic carbon at the end of composting.Compare to CK treatment，the total nitrogen was raised by 12.96% and 18.22% in EA1 and EA2 treatments，and organic carbon was raised by 6.04% and 11.28%，respectively.All treatments have met the relevant requirements of composting maturity，in the aspects of fecal coliform number，and ascaris egg mortality.Through the comprehensive analysis of ammonia emission reduction efficiency，nitrogen and organic carbon retention of composting，the multiple spraying addition of oxalic acid is better than the initial one-time addition.The experimental conclusion can provide a reference for the efficient technology of ammonia emission reduction in compost.