Abstract: The flame retardant cellulose fibers were spun by an eco-friendly process,i.e.,adding certain P-N containing flame retardants,1,2-bis(2-oxo-5,5-dimethyl-1,3,2-dioxyphosphacyclohexy1-2-imino)ethane(DDPN) and N,N′-bis(5,5-dimethyl-2-phospha-2-thio-1,3-dioxan-2-yl) ethylene diamine(DDPSN) to the carbamate solution,and the mechanical and flame retardant properties of the prepared cellulose fibers were studied.The results show that the dry tenacity is less than that of viscose fiber,but wet tenacity and wet modulus of the polyblend fibers are slightly higher than those of viscose fibers.When the mass fraction of this kind of retardants in the cellulose fibers is larger than 18% and the limiting oxygen index(LOI) of the polyblend flame retardant cellulose fibers is larger than 25%,the fibers meet the flame retardant requirements.