We investigated the effects of actinomycetes on the growth and antioxidative characteristics of perennial ryegrass under drought stress,using soil inoculating actinomycetes agent and pot experiment.Results showed that:(1)actinomycetesinoculated treatment significantly promoted the plant growth under drought stress,of which root tiller number and root fresh weight were significantly increased by 35.00% and 37.47%,respectively(P<0.05);(2)the contents of total chlorophylls and carotenoid were significantly increased by 12.02% and 10.38% with actinomycetesinoculated under drought stress;(3)the three main antioxidative enzyme activities of SOD,POD and CAT were increased by 12.72%,2.38% and 24.83%,respectively,while SOD and CAT activities showed significantly increased with actinomycetes inoculation.These results indicated that actinomycetesinoculated in drought soil improved the contents of total chlorophylls and carotenoid,enhanced the antioxidative characteristics of perennial ryegrass,and thus significantly promoted the plant growth by increasing plant biomass.