Biodegradable film was prepared through adding PLA to PHA using blending method to enhance mechanical property and the film formation ability of PHA. The preferable blending processing technological parameters were determined through viscosity measurement, which were the mixture temperature of 200℃ and the rotational speed of 20 r/min. The mechanical property of blended film was determined by the mechanical testing. The results showed that the film tensile strength can achieve 30 MPa and the breaking elongation rati0 100% when proportion of PHA to PLA is 100 : 50 (W/W). The composting degradation experiment confirmed that the blending film have degradable property.