Toosendan Fructus， Melia toosendan Sieb. et Zucc. is the dried and ripe fruit of Meliaceae plant， which is a Chinese Herbal Medicine in regulating Qi. Its main effect includes releasing liver qi， promoting qi circulation to relieve pain and killing insects. And it is commonly used in the chest and abdominal pain， bloating， colic， insect abdominal pain embolism. We first found it in “Shen Nong’s Herbal Classic”. This article would trace Toosendan Fructus from its name， morphology， properties and tropism of herb， processing and toxicity and so on.