Since all countries in the world have begun to restrict lead-containing products, lead-free stabilizers have become the general trend. Since simple calcium/zinc and barium/zinc metal salts are used in PVC heat stabilizers, there are problems such as poor stability, so it needs to be processed according to the product processing technology. Compound a variety of compounds according to the purpose to achieve the effects of improving thermal stability, weather resistance and transparency. In the late 1970s, diketones were introduced into heat stabilizer systems, making them an integral part of stearate heat stabilizers, especially calcium-zinc or barium-zinc complex metal heat stabilizers. Dibenzoylmethane is a new type of environmentally friendly diketone product. It is compounded with stearate heat stabilizers to improve the initial coloring of PVC, inhibit zinc burning, and improve heat and light stability.