Kinds and contents of organic acids in the compost of chicken feces and their changes were studied. The results indicated that a lot of organic acids came into being and accumulated; the content of organic acids was 88.3 cmol kg^-1 DM reaching the peak after 5 weeks of composting; the content of non-volatile organic acids had two peaks at the third and fifth week of composting separately; the peaks of the volatile acids occurred at the sixth week and ninth week separately. After 9 weeks of composting, the content and number of the kinds of organic acids declined sharply, apart from aromatic acids such as benzoic acid, benzenedicarboxylic acid etc., and their ramification. There were many small molecular organic acids such as butane diacid and their derivatives and some big molecular fatty acids coming into being.