As the mass production and wide application of plastic, the waste plastic products lead to white pollution to environment, resulting in serious pollution to the human living environment and affecting the ecological balance. Therefore, the complete degradation plastic productions and R & D of new productions attract the attention and interest of many scientists.

    The degradation plastic is generally regarded as material that can be degraded by sunshine, earth, moistness or the microbe in air. The induction period of photodegradable plastic (some photo sensitizers and other assistants are added to common plastic) is difficult to control, so such plastic is finally degraded into chips and particles. The starch filling degradable plastic is the common plastic in which starch or modified starch and other assistants are added. The starch in such plastic can be degraded by microbe, while the common plastic can only be degraded into chips and particles, which can be mixed with earth, belonging to incomplete degradable plastic.

　　 The biodegradable plastic becomes the international research emphasis, which possesses the characteristics like biological degradation, hydrolytic decomposition and non-toxicity, and can be finally degraded into water and carbon dioxide. As the internationally recognized environment and life protection material, the biodegradable plastic has brought great attention to the world and many countries invest extensive fund to support its research and development. The main trouble that restricts the wide application of biodegradable polyester is that the cost of raw material is too expensive, so that it's price is too high to compete with common resin.

　　Polyglycolic acid (PGA) or polyglycolide(PGL) of high molecular weight has been successfully used as a biodegradable suture materials, Dexon. FDA approved of a kind of function the excellent absorbing the suture in 1977. Its safety gets the complete confirmation with medical treatment effect. We have been synthesized PGA of moderate-low molecular weight, having the low-cost. PGA as the trigger is added into the common plastics inducing the common plastics to degrade.

    As an emerging technology, the biological degradation will rapidly become very popular world wide.