Abstract: The CO2 release in Citrus orchard soil samples respectively applied with organic fertilizer, chemical fertilizer, chemical and organic fertilizer were analyzed during their incubation period to study the effects of different edible fungus residues on organic carbon mineralization in orchard soils.The results showed that the rate of SOC mineralization decreased quickly at the beginning, then decreased slowly during the middle incubation time, and kept relatively stable during the later incubation time.Correlation analysis showed that there was a significant correlation between the mineralization rate of SOC and C/N.Compared with the treatments of no-fertilizer and chemical fertilizer, organic fertilizer application in the soil could improve soil microbial activity, and average mineralization rates of the soils increased by 5.2%-104.6%.But there was no significant increase of potential carbon mineralization in the ratio of total organic carbon with the increasing of the amount of organic fertilizer in citrus orchard with the increase of organic fertilizer, indicated that mixed application of inorganic and organic fertilizer on soil could increase the accumulation of soil organic carbon.