Abstract: It reported on the study summarization and development on Oldenlandia diffusa willd. Study on the chemical constituents of the plant was summarized. It was known by dare that the plant contains anthraquinones, terpenoids, steroids, organic acid, polysaccharides, and so on. The study of Pharmacology has shown that Oldenlandia diffusa willd has effect on antibiosis, anti-inflammation, anti-tumor, and so on.