According to the international standard DIN EN 13432, the biodegradable plastic for compost should follow three criterias and decompose to natural elements over 90% within 180 days : 1. Biodegradation: Under temperature about 60℃ with oxygen environment, should decomposed over 90% within 180 days. 2. Disintegration: After laboratory scale decomposition over 180 days, the packaging waste residue which large than 2 mm should not over 10%. 3. Safety: As the low heavy metal content estimation for ecotoxicology (the OECD guideline 208, experiment with two different types of plant), the growth ability of bacterial, microorganism and plant should not be effected. To ensure the biodegradable plastic for compost could really achieve the benefit of decomposition. EU, USA, Japan, Australia, etc., all come out with a rigorous certification protocol. In Taiwan, the EPA (Environmental Protection Administration) also has an environmental label certification for biodegradable plastic.