Abstract: The writer,in accordance with some original materials collected by himselfand others recently,selected some typical places,some typical plants and theirtypical communities in the local vegetation;and then,based on the concept,basis and method of vegetational regionalism,compared with the plant floristicregion.Finally,he recognized that these were two different courses in botany,and they were only similar in their regions,but not the same.After discussion,he,based on actual natural distribution of deciduous broad-leaf forest in N.E.China,drew its northern boundary as follows:Beginning from Jian,along the southern slope of Laoling,passing throughHuanren,Benxi,Kaiyuan,Facu,Fengjia,Kulunqi,Chifeng,and entering HebeiProvince near Weichang.