With the example of typical fabrication process of solid agent, the causes of producing dusts in solid agent cleaning workshop were briefly analyzed in this article.

With respect to the fundamental principles of powder mixing,the characteristics of various mixing equipment used in solid agent preparation were simply described.

According to the request of the our country GMP,combining design experience,the different granulating methods and total mixing methods before the solid preparation were introduced in this paper.

Corn straw was modulated in bag minisilos at 25℃ in greenhouse to evaluate the effects of methyl acid ,multiple lactobacillus, cellulose enzyme,solid modulation preparation (multiple lactobacillus +enzyme preparation) and liquid modulation preparation (efficient microorganism) on the fermentation, composition and ruminal degradation when they were applied along or combined.