采用常规方法对西藏索马地区高山草原土中放线菌进行了初步鉴定和分类，并对链霉菌属进行了生理生化鉴定。结果表明，该地区放线菌可分为１０个属，以链霉菌属占优势；链霉菌属可分为１２个类群，金色类群占优势。生理生化试验表明，参试菌株淀粉水解，明胶液化能力较强，纤维素分解能力较弱；拮抗试验中抗细菌多于抗真菌菌株，细菌中以抗Ｇ＋细菌为主。 The actinomycetes in the alpine steppe soil in Soma area of ​​Tibet were preliminarily identified and classified by routine methods, and the biochemical identification of Streptomyces was carried out. The results showed that the actinomycetes in this area can be divided into 10 genera, Streptomyces dominant; Streptomyces can be divided into 12 groups, the dominant gold group. Physiological and biochemical tests showed that the tested strains were hydrolyzed by starch and had stronger liquefaction ability and weaker cellulolytic ability. Among the antagonistic tests, antibacterial strains were more than antifungal strains, and bacteria were mainly anti-G + bacteria.