| [Objective] In order to comprehensively control the quality of whole plant corn silage of Scale Dairy Farms in Hebei province, and to provide scientific basis for corn silage production in future.[methods] By using professional sampler to collect whole plant corn silages of 284 scale dairy farms that were participated in the determination of dairy production performance (DHI) in Hebei province in 2019,the silage samples were refrigerated and sent to the feed testing room,through using near infrared technology to accurately and quickly test the dry matter (DM),detergent fiber (NDF), acid detergent fiber (ADF), starch and other nutrition indicators, finally analyzed the test results. [result] The results showed: the quality of whole plant corn silage in Hebei scale dairy farms is at middle level in domestic, and have a high room to improve. The dry matter (34.06%), starch content (32.01%, dry matter basis) and lactation net energy (1.68 Mcal/kg) of the whole corn silage in Handan dairy farms reach the highest level and is relatively the best in Hebei province, while that is relatively poor in Qinhuangdao area. |