Biodegradable plastics refer to a class of plastics that are degraded by the action of naturally occurring microorganisms such as bacteria, molds (fungi), and algae. The ideal biodegradable plastic is a polymer material with excellent performance, which can be completely decomposed by environmental microorganisms after being discarded, and Z is eventually inorganic to become a component of the carbon cycle in nature. "Paper" is a typical biodegradable material, while "synthetic plastic" is a typical polymer material. Therefore, biodegradable plastics are polymer materials that have both the properties of "paper" and "synthetic plastics".

生物降解塑料又稱生物分解塑料，指在自然界如土壤和/或沙土等條件下，和/或特定條件如堆肥化條件下或厭氧消化條件下或水性培養液中，由自然界存在的微生物作用引起降解，并Z終完全降解變成二氧化碳（CO? ）或/和甲烷（CH?）、水（H?O）及其所含元素的礦化無機鹽以及新的生物質的塑料。

Biodegradable plastics, also known as biodegradable plastics, refer to plastics that are degraded by natural microorganisms under natural conditions such as soil and/or sandy soil, and/or specific conditions such as composting or anaerobic digestion, or in aqueous culture solutions, and ultimately completely degrade into carbon dioxide (CO?) or/and methane (CH?), water (H? O), and mineralized inorganic salts of the elements contained therein, as well as new biomass.

按原料成分來源分類，生物降解塑料可分為生物基生物降解塑料及石化基生物降解塑料兩類。

According to the source classification of raw materials, biodegradable plastics can be divided into two categories: bio-based biodegradable plastics and petrochemicals based biodegradable plastics.

生物基生物降解塑料主要可分為四類：一類為天然材料直接加工得到的塑料；第二類為微生物發酵和化學合成共同參與得到的聚合物；第三類為由微生物直接合成的聚合物；第四類為以上這些材料共混加工得到的或這些材料和其他化學合成的生物降解塑料共混加工得到的生物降解塑料。

Biodegradable plastics based on biological materials can be divided into four categories: one is plastics directly processed from natural materials; The second category is polymers obtained through microbial fermentation and chemical synthesis; The third category is polymers directly synthesized by microorganisms; The fourth category is biodegradable plastics obtained by blending these materials or by blending these materials with other chemically synthesized biodegradable plastics.

石化基生物降解塑料是指以化學合成的方法將石化產品單體聚合而得的塑料，如PBAT、聚丁 二酸丁二醇酯（PBS）、二氧化碳共聚物（PPC）等。

Petrochemical based biodegradable plastics refer to plastics obtained by polymerization of petrochemical product monomers using chemical synthesis methods, such as PBAT, polybutylene succinate (PBS), carbon dioxide copolymer (PPC), etc.