Objective: Studies on growth habit of Pueraria lobata and dynamic changes of the active substance content of puerariae Lobatae Radix. Method: The method of determining the content of alcohol-soluble chemical composition was in line with Pharmacopeia; puerarin

aidzin

daidzein were determinated by HPLC. The contents of flavonoids were assayed by ultraviolet spectroscopy. The contents of polysaccharide were determined by phenol-sulfuric acid method. Result: This paper elementarily reveals growth habit of Pueraria lobata. The content of active substance appeared regular changes and was highest in August and September of perennial Puerariae Lobatae Radix. Conclusion: This result fruther provides scientific basis for resoures protection

rational development and comprehensive of P. lobata.