Abstract: An analysis of the seed plant families in Xinjiang shows that the flora had a diverse geographical elements, with an overwhelming number of temperate elements (55 families) accounting for 47.8%, including tropical-to-temperate, subtropical-to-temperate, temperate, temperate-to frigid.The element accounts for 73.3% except cosmopolitan families, pure tropical and tropical-to subtropical families are lack in the flora.This phenomenon is the result of the broad latitudes and diversified habitats in Xinjiang.It is shown that the dominant famlillies and typical familes are of various geographical elements, whereas most of them are cosmopolitan.This indicates that, in family level, the seed flora of Xinjiang is an integral part of the Angala Flora.

Key words: Seed plant, Families, Geographica elements, Flora