Abstract: It is well known that Eucommia ulmoides Oliv. is an endemic tree species of China. According to historical data, it has been two thousand years since the bark of eucommia was used by man. In this paper, we shall deal with the forms, distribution and introduction of Eucommia ulmoides. According to forms of the bark, Eucommia ulrnoides may be classified as the form of coarse bark and that of lubricious bark, the former looks like oak bark (See fig. 1) and the latter like chinese aspen bark (See fig. 2). Eucommia ulmoides is widely distributed in china, they are distributed in latitude 25—35 N, in longitude 104—119 E. The vertical distribution of Eucommia ulmoides, in general, is located at about the altitude of 300—1,300 meters. In this region of climatic optimum there are several tree species frequently met with. they are aleurites fordii, Toxicodendron vniciflua, Quercus variatilis, Quercus acutissima, Trachycarpus fortunel, Cupressusfunebris, Sapiun seliferum, Firmixna simplex, Juglans regix, Taxus chinensis, Cunnighamia lanceolata, Pinus massonixna, Liquidanbar formosana, Castanea mollissima, as well as Sophora Japonica. At home, Eucommia ulmoides was introduced into many places on a large scale in the fifties. At present the introduction of Eucommia ulmoides has obtained success in many places. In the light of Beijings introduction, it has removed 5 degrees in latitude about from the south to the north. that is just the region we called the southern temperate zone. The mainly indicator of temperature in this zone are: the temperature of plant growing (≥10℃) is 3,100°-3,400℃ to 4,250°-4,500℃, the absolute minimum temperate is-30°-0℃.