Abstract: The impacts of three cellulose-degradation fungi isolated from compost on CO2 release from fermentation of organic solid wastes and the effects of the fermentation on CO2 enrichment in greenhouse were studied by carrying out an incubation experiment and a trial in greenhouse.Although all three cellulose-degradation fungi(fungus A,fungus B and fungus C) could accelerate CO2 release from fermentation of organic wastes,fungus A and fungus C were more efficient comparing to fungus B.The treatment inoculated with the mixture of three fungi showed the best results on CO2 release.The concentration of CO2 in greenhouse was lower than 300 L/L during the majority of daytime,indicating CO2 is deficient.CO2 concentration in greenhouse could also largely be improved by fermentation of organic solid wastes without fungus inoculation,but the effective duration only lasts around 9 days.The fastigium and effective duration of CO2 release could be significantly prolonged by inoculating fermentation medium with the mixture of three fungi,which could maintain CO2 concentration higher than 800 L/L during daytime for at least 14 days.