The hairy roots from the medicine plants transformed by the Agrobacterium rhizogenes have unique advantages include hormone autotrophy,fast growing and in large scale production of secondary metabolites and genetic stability ,and have widely used in many kind of medicinal plants. To provide an effective, fast, and a scale up solution to the exiguous active constituent of Chinese crude drug ,and solve the problem of shortage resources of natural medicinal plants. This review summarizes the applications in ge...