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  • Biodegradable plastic is plastic can be described by microorganisms with naturally method’s. Carbonydrate in Durio zibethinus Murr flour be found polysaccharides can be used as raw material for biodegradable plastic. This study aimed to determine the effect of various tapioca flour on the quality of biodegradable plastic using a plasticizer polyvinyl alcohol with analysis has been done. Making biodegradable plastic is done in three stages including, durio zibethinus murr flour manufacture, manufacture of biodegradable plastic with the various mass tapioca flour and analysis for plastic biodegradable include measurement of tensile strength, and elongation, water resistance, and degradation. Composition the using biodegradable plastic various mass tapioca flour of 1 gram, 2 gram, 3 gram, 4 gram, and 5 gram with 4 gram of durio zibethinus murr flour and plasticizer 2 gram. The result of this experiment is thin sheet of biodegradable plastic that have been tested mechanical properties. The best condition 61,91 percent of water resistance , 0,0145 MPa tensile strength, and 6,66 percent of the extension. Keyword : biodegradable plastic, durio zibethinus murr, polyvinyl alcohol, plasticizer