BY-1 which is a new cultivar of Pinellia ternata Thunb.Berit was selected from the germplasm resources of xihe Pinellia ternata Thunb.Berit of Gansu province.The strain which was bred via combining classical system breeding and modern biotechnology by 7 years.The process was tissue culture，expanding propagation，comparison and identify.This cultivar had obvious morphological characteristics，growth vigorous，strong resistance to disease and stable hereditary feature.Its content of effective medicinal ingredients of the new Pinellia ternata Thunb.Berit variety is higher than that of ‘stable content of regulations of the People’s Republic of China Pharmacopoeia’.