This study was conducted from May, 2002 to September, 2003 by comparing the growth of Tetraena mongolica Maxim in ex situ seeding area and analyzing the adaptabilities of T.mongolica to soil and climate factors. Some results were shown below: Firstly rank of T.mongolica growth was Dongsheng soil in Wuhai area (12.17g), local soil in Wuhai area (10.57g), Wuhai soil in Dongsheng area (3.10g), and local soil in Dongsheng area (2.59g). There was no significant difference among soil derived from the same area in terms of the amount of growth (p≥0.05). However, the growth of T.mongolica showed more significant difference in the same soil from different areas. Consequently, the survival of T.mongolica was most likely to be determined by climate other than by soil. Secondly content of available N, P, and K showed significant differences between T.mongolica distribution area and their ex situ conservation area. However it contributed little to the growth of T. mongolica. The amount of 9 kinds of trace elements was higher in T.mongolica than in soil, which suggested that this plant had the ability to accumulate trace elements. Therefore the content of 9 trace elements although they showed significant differences. Impacted little on the survival and growth of T.mongolica There were significant differences between T.mongolica distribution area and their ex situ conservation area in annual mean precipitation (157.89＜381.48mm, p≤0.05), monthly mean precipitation (p≤0.05), annual mean temperature (9.84＞6.16℃, p≤0.05), monthly mean temperature (p≤0.05), warm index (97.6467＞68.2267，p≤0.05), cold index (-39.5200＜-53.1200，p≤0.05), humidity index (1.6151＜5.6610，p≤0.05), and integrated index of precipitation and temperature (13.6031＜32.6013, p≤0.05). In the distribution area of T. mongolica, the mean day-to-night difference in surface atmosphere temperature is around 12℃. However, this difference for surface soil temperature reaches to about 35℃ due to large amount of middle-fine sand and coarse sand in soil profile. In ex situ conservation area the prevalent soil is chestnut soil containing some clay. The difference in surface soil temperature is very low. Therefore although the day-to-night difference in surface atmosphere temperature is around 10℃ which is almost the same as that in T.mongolica distribution area.