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The aim of the experiment was to study the nutrient composition and fermentation quality of mixed silage of corn straw and potato starch residue in different proportions. Using the corn stalk and potato starch residue as raw materials, the experiment adopted a two-factor experimental design, taking different mixing ratios of raw materials (CKB1, CKB2, CKB3) and different mixing ratios after adding bacteria (AB1, AB2, AB3) as treatments. The conventional nutrition and fermentation quality of mixed silage was analyzed after 30 days. The results showed that the interaction of different raw material ratios and bactericides had significant effects on pH values, lactic acid, acetic acid, acid detergent fiber and ammonia nitrogen/total nitrogen content of silage (P<0.05). Under the same mixing ratio of raw materials, the addition of bactericides could increase the lactic acid content of silage (P<0.05), and decrease the pH value, acetic acid and ammonia nitrogen/total nitrogen content (P<0.05). Under the same treatment, the concentration of crude protein and soluble carbohydrate and relative feeding value of silage decreased, while the concentration of neutral detergent fiber, acid detergent fiber and crude ash increased. The concentration of dry matter, crude ash, soluble carbohydrate, pH value, crude protein, neutral detergent fiber and acid detergent fiber and their relative feeding value were significantly affected by different raw material ratios (P<0.05). The study indicates that potato starch residue to corn straw is 7:3, and the better silage effect is obtained by adding bactericide. [ABSTRACT FROM AUTHOR]