Haixing”living dry bacteria were used to treat the corn straw, then we used the microbial-treated straw to feed on the finishing caprine. The results showed that average daily intake of the group fed with microbial treated straw was increased 16.7％ than that of the control group, and average daily gain of the group fed with microbial treated straw was higher than that of the control group by 74.36%. It could save feeds 1.09kg, compared with the control group when the cattle gain 1kg bodyweight. And the economic benefit increased by 17.82 yuan per caprine.