Abstract: Polylactic acid/polyurethane/polyvinyl pyrrolidone composite material was prepared by melt blending method. The samples' structure and property were characterized by Fourier transform infrared spectroscopy, SEM, polarized light microscopy and degradation performance test. The results showed that PU and PVC could be uniformly dispersed and effectively incorporated in the matrix PLA. The tensile strength of the composite was up to 69.18 MPa, and the elongation at break was increased 100%. The degradation experiments showed that composites in different media prolonged the degradation time and decreased the quality