Over 2×10~8 tons of polymers are produced every year, and a large portion of polymers faces the degradationproblem. There are many effective methods to protect polymers against degradation and the addition of stabilizers to polymerremains the most convenient and effective way of enhancing polymer life and performance. In this article, a series of effectivestabilizers with optimal molecular weight (MW), including common, monomeric and polymeric stabilizers (antioxidant andlight stabilizer) were synthesized using isocyanation, controlled isocyanation, hydrosilylation, epoxide addition, macro-reaction of stabilizing functional compounds and polymerization of monomeric stabilizers. The structure and performance ofthese new stabilizers were characterized by using IR, NMR, MS, UV-spectra XPS and elemental analysis. The currentdevelopment of stabilizer synthesis was also reviewed. Over 2 × 10 ~ 8 tons of polymers are produced every year, and a large portion of polymers faces the degradationproblem. There are many effective methods to protect polymers against degradation and the addition of stabilizers to polymerremains the most convenient and effective way of enhancing polymer life and performance. In this article, a series of effective stabilizers with optimal molecular weight (MW), including common, monomeric and polymeric stabilizers (antioxidant and light stabilizer) were synthesized using isocyanation, controlled isocyanation, hydrosilylation, epoxide addition, macro-reaction of stabilizing functional compounds and polymerization of monomeric stabilizers. The structure and performance of the new stabilizers were characterized by using IR, NMR, MS, UV-spectra XPS and elemental analysis. The current development of stabilizer synthesis was also reviewed.