Using adjustment calculation with the uniform starting datum on the 50 terms of mobile gravity data from 1987 to 2011 in Xinjiang, the authors obtained the isoline map of gravity field in Urumqi and its surrounding areas, time-series curve of gravity difference of different measuring segment, profiles of gravity variation in three measuring line in the central Tianshan Mountains, Xinjiang. The results showed that the spatial distribution of gravity was more centralized and the positive gravity variation areas alternated with the negative ones in Urumqi and its surrounding area. The gravity was negative which varied largely in Dushanzi and Ningjiahe measuring area, which showed that curst was uplifting and the material density decreased continuously in these two measuring areas.