Abstract: The distribution map of each species is given(partialy compiled).According to that, geographical distribution of the genus Caragana Fabr.are systematically studied.Firstly, classification, evolution system of the genus are discussed.It can be summarized follows: Classification system: There are about 80 species in the genus belonging to 14 series, 6 section.Phytogeographical distribution: Firstly, the geographical distribution map of each species are given, basing that, distribution pattern of each species in each series and that of each series in each section are discussed.Then, distribution characteristics of the genus, Asia-temperature zone distribution, two center of abundance, expansion in west-east direction(latitude) and decline in north-south direction(longitude) are resulted.Origin, differentiation, migration: Series Caraganae is original type which take place(originated) from East-Asia in early-middle period of Territory period.The original type migrated rapidly in large scale, and formed the background of the genus evolution.Because of the change of climate and habit by Tibet plateau lifting, variety group was selected out in different place.New taxon units were produced in place with constant changing of climate and habit.In addition, relationship between morphological characteristics and climate as well as habit are studied.

Key words: Caragana, distribution, differentiation