Abstract: A general study was made on the composition,characteristic and nature of the dominant plants in the wild fruit forest in Tianshan Mountains to discuss the origin and development of the wild fruit forest.The result indicated that the floristic elements of the wild fruit forest were complex.Owing to the interpenetration of floristic elements and the overlap of distribution,the wild fruit forest had no absolute native feature.Among them,the temperate elements were dominator(33.33%),and the Siberian-Tianshan Mountains transition elements(17.54%) joint the wild fruit forest to the northern Angara flora,and Himalayas elements(10.53%) also connected the wild fruit forest to Cathaysian flora.The majority area of Xinjiang was ever one part of the Tethys Sea,and some remains of floristic elements(5.25%) from Old Mediterranean could still be found.Tianshan Mountains was one of the richest areas possessed of plants in Xinjiang area and its ratio of constituents(33.33%) was upmost.The characteristic elements of eastern Tianshan Mountains represent the native part of the wild fruit forest and which should be local origin.The origin of the wild fruit forest was various,including the floristic elements from Angara,Old Arctic,Old Mediterranean,Cathaysian and Xinjiang.