The introduction of micro winceyette fiber could effectively improve the tensile strength, water resistance and thermal stability of TPS because of the good adhesion between starch and fiber. With the increase of fiber content from 0 to 20%, the initial tensile strength was trebled up to 15.16 MPa, while the elongation was reduced from 105 to 19%. The reinforcement effect was gradually weakened with the increase of water content, but at the high water contents (O30%) both the fiber and water content had no effect on the tensile strength. When the weight ratio of the gross plasticizer and cornstarch (0.3:1) was kept constantly, TPS with below 15% fiber content could be processed quite well and TPS with below 20% fiber content could effectively restrain the starch retrogradation without the additional plasticizer.