CCMC/PVA blend film was prepared by solution mixing method. The effect of PVA, PPE and glyoxal on the mechanical and biodegradable properties of blend films were studied. The results showed that the mechanical property of CCMC/PVA blend films increased remarkably and the biodegradable properties of CCMC/PVA blend films were controlled artificially with the added amount of phragmoid addition agent. The tensile strength was 22.5 MPa, elongation at break was 258%, the growth rate of microbe was grade-4 by agar plate culture for 50d and the weight loss ratio of CCMC/PVA blend films was 92% after 100days under the earth when the mass fraction of PVA was 30%, the mass fraction of PPE was 0.6% and the mass fraction of glyoxal was 2% respectively.