The experiment was to investigate the effect of adding distillers grains on the silage quality and the appropriate proportion of adding distillers grains. The experiment was divided into seven groups. No distillers grains were added to the Pennisetum hydridum, and no imperial bamboo grass was added to the distillers grains group, and the mixing ratios of grain stillage and Pennisetum hydridum in other groups were 1∶9 (10% group), 2∶8 (20% group), 3∶7 (30% group), 4∶6 (40% group), 5∶5 (50% group), respectively. Mixed silage of distiller's grains and Pennisetum hydridum for 60 d, carrying out sensory evaluation and analysis of conventional nutrients and fermentation quality indexes. The results showed that the sensory quality of silage materials without grain stillage was 'inferior', while the sensory quality of ensilage silage with grain stillage was significantly improved, the sensory quality of 40% group and 50% group were 'superior'. Compared with Pennisetum hydridum group, the content of MC, Ash, NDF,CF, CL and HC in mixed storage group were significantly decreased (P<0.05). The pH value and BA content of silage in all mixing groups were significantly lower than those in Pennisetum hydridum group without grain stillage (P<0.05). The total nitrogen content was significantly higher than that in Pennisetum hydridum group (P<0.05). The experiment indicates that adding grain stillage can improve the silage quality of Pennisetum hydridum according to sensory evaluation and related indexes, and the appropriate proportion of grain stillage and Pennisetum hydridum is 4∶6. [ABSTRACT FROM AUTHOR]