Abstract: In order to make sure the best provenance of each tree species for afforestation in Ordos,the DBH(ground stems),tree height,crown size,and new branches of seven species were observed.The result showed that local species were the most adaptable and grew well and the species which were in troduced and domesticated for many years and performed well also.It was suggested that native species and species introduced and domesticated for many years should be promoted and applied in the future greening process.We must insist on introducing species from the corresponding region(sub-district)or adjacent seed region(sub-district),and fromthe region with poorer natural conditions.

Key words: trees species for afforestation, introduced species, adaptability, local species