To find the relationship between the effect of Chaihu and medicine species and parts.Methods:Combing through ancient literature，summed up the evolution of Chaihu efficacy and analyze its relationship with medicine species and medicine parts.Results:“Shen Nong’ Ben Cao Jing” period of application of Chaihu species has not test.After the Tang Dynasty，Bupleurum scorzonerifolium Willd.，B.yinchowense Shan et Y.Li is considered the top grade，while Stellaria dichotoma L.var.lanceolata Bge.in a very long period of time was also used as top grade Chaihu，which could become Chaihu a “tonic labor” Cause effect described.Chaihu root been used for medicine since ancient times.Since the late Qing Dynasty，the Yangtze River area in the whole plant or the aerial parts of medicine.Same period of the rise of “ Bupleurum chinese robbing Hepatic Yin” said the active may be related to change parts of medicine parts，but this need further experimental study.Conclusion:Chronicles of Chaihu efficacy understanding is not uniform，it may be applied Chaihu species and different periods in different parts caused by medicine.