At present, domestic production of forage harvester variety. Their links with power equipment can be divided into traction, suspension and self-propelled three kinds, according to the production capacity of equipment can be divided into low-productivity model, supporting dynamic power of about 13KW; moderate productivity models, supporting power power of 40 ~ 44KW; high productivity models, supporting power 80KW power in general over. When selecting corn harvester, must consider how much silage production, factors on silage quality requirements, number and size of the existing power ancillary equipment, and silage harvest weather conditions. Currently, the domestic alternative corn forage harvester with at least eight kinds of models. From the technical requirements in terms of silage. To ensure that forage quality and reduce the loss of nutrients, the process should be as short as possible silage, so the selection of high-productivity model is more reasonable before silage material should be crushed, chopped. The purpose is to: ① easy compaction, drain the material in the middle of the air; ② inoculants to increase the contact area and the material is conducive to bacteria multiply rapidly; ③ make raw sap oozing full, moist material surface is conducive to leaven rapid microbial growth and improve the quality of silage. The degree of raw chopped should be determined according to the type and quality of raw materials fed livestock. Generally big water green materials can be cut longer, feeding livestock fodder can cut longer, moisture texture relatively small hard materials can cut some fine, fine, or labeled. General storage material cut length 2 ~ 5cm. For raising cattle and sheep silage use Qufu Wan Teng Machinery Co. rub straw shredder better.