Rare earth heat stabilizers were first developed by China in the late 1970s. Rare earth stabilizers are suitable for soft, hard and transparent and opaque PVC products because of their non-toxic, high-efficiency and versatile, and suitable price. It is expected to gradually replace general heat stabilizers and organotin. At the same time, the rare earth heat stabilizer also has the advantages of non-toxic and environmental protection. The oral toxicity of various rare earth compounds is on the level of low toxicity or slightly toxic.