||It is a 40 year-long expectation to develop catalyst for copolymerization of CO2 and propylene oxide with high activity and selectivity, and great progress has been achieved, among which bifunctional salen Cobalt catalyst is still the most successful one. However, if biodegradable plastics is considered as the end use for CO2 based plastics (PPC), the strict heavy metal or toxic metal standard for compostable plastics constitutes the main obstacle for the future of this catalyst system. Therefore, heavy metal-free catalyst design is a tendency for this purpose. In the past ten years, aluminum porphyrin catalyst has been the focus in our group, which will be discussed in this talk, including mononuclear single component bifunctional catalyst or binary catalyst, and multinuclear aluminum porphyrin catalyst. Such catalyst system can produce PPC in high molecular weight of over 200 kg/mol with relatively narrow polydispersity, the obtained PPC can be stabilized by simple post-polymerization treatment without complicated separation process. Such PPC is a real green plastics without any heavy or toxic metals, well suitable for the purpose of biodegradable plastics.