The current air pollution from the burning of stubble and corn cobs in northern areas impact on public health, causing allergies, asthma, tuberculosis and nasopharyngeal carcinoma such effects is the source of the research of corn cob purple fill 0 - 40% (w / w ) combined with polylactic acid in the production process of bioplastics. Evaluation of the bioplastic suitable for use in packaging materials. Experiments indicated that adding corn cob purple more tend to the glass transition temperature and melting temperature increases. bioplastics that properties is 1.5x10-4 m / m2.mmHg.day, 18.02 ± 0.33 MPa, 29.42 ± 0.05 ͦ C, 145.84 ± 0.30 ͦ C and biodegradable percent 34.97 ± 1.1 at 10 week. Adding purple corn cob can increase the tensile strength, reduced Water Vapor Transmission Rate and slow the degradation of bioplastic.