Abstract: Three treatments of control group （CK）, lactic acid bacteria 1 （LAB1, 2.5 g/t） and lactic acid bacteria 2 （LAB2, 5.0 g/t） with three replicates were set up to study the effect of lactic acid bacteria on qualities of Achnatherum splendens silage. The results showed that the fermentation quality of CK was poor. Compared with CK, the lactic acid bacteria in the silage could reduce pH value and increase the content of lactic acid and in vitro digestibility of DM significantly. It is indicated that treating Achnatherum splenderts with lactic acid bacteria could improve the silage quality and feeding value.