By taking parts of Mt. Gaolan and the Xujiashan Experimental substation,General Extension Station of Forestry Science and technology of Gansu Province as examples,the coverage of vegetation communi-ties,importantvalue of differentcommunities,and species diversity in artificial vegetation region,enclosed region,and contrastregion were investigated. The resultindicates thatas long as the tree varieties are prop-erly chosen and technological measures for afforestation are suitable to local conditions,the ecological envi ronmentin the area similar to thatin the north mountain of Lanzhou City can be gradually improved. In addi? tion,the enclosure measure is proved to be an effective way for vegetation restoration in the region. The artificial vegetation species,in terms of their importantvalues,rank in the descendantorder of Caragana microphylla,tamarix ramosissima,Platycladus orientalis,A mmopiptanthus mongolicus,Nitraria sibirica,Lycium chinense,Prunus aymeniaca,and Prunus daridiana. Under any circumstance,Reaumuria soongorica and Symp egma regelii Bge are dominantspecies,showing a strong adaptation to local environment. Diversified index,evenness index,and richness index of artificial vegetation are close to those in enclosed forestregion and differ greatly from those in contrastregion. Using comparability comparison methods,we can conclude thatartificial vegetation region,enclosure region and contrastregion have greater differences in the comparability analysis. With the constantincrease of species quantity and types in forest,the three areas themself will demonstrate greater differences.