Abstract: Different doses of probiotics EMwere added to the diets of blue fox in its growth phase to study the effects of EMadditives on its growth, digestion metabolism and immune function. The results showed that with EMadditives applied, the ingestion and average daily gains were increased remarkably (P<0.05).The apparent digest rate of crude fibre,crude protein,mineral elements Ca,Pand NPUcould be increased (P<0.05) and correlated with its dose, and the digest rates of the later four targets in group Ⅲ were increased by 8.21%,16.27%, 9.82 %,and 12.13%,respectively.EMadditives could not increase the digest rate of ether extral and Nfree extract.Disease of diarrhoea and blood in stool could be prevented and cured, and immune function and the survival rate of fox in growth phase could be increased remarkably. EM, which a kind of efficient,safe and environmental protection additives, can be extended and applied in farming of fur animals.