Through the research of ″ the double2cropping cultivation″,selects the suitable variety and the best sowing time,spread and application in production,improving the yield of forge green oat and quality of milk production in dairy cow,provides the theory basis. This experiment designed two factors of the variety and the sowing time,used the random² ized region design,three repetitions. The result indicated that :the number of leaves of late mature varieties was nine,more than two premature varieties. Seeingfrom the leaf area index,the late mature varieties were higher than premature varieties in the second quarter and in the first quarter 1106 to 1108. Seeing from the photosynthetic production rate,at boot stage and heading stage,the late were higher respectivly than premature varieties 0117 to 1126 g/ (m²· d). From the leaf area duration,improved respectively 21 762157 to 23 370109 (m²· d). From the whole plant dry weight,improved respectively 0176 and 1101 g evey plant. For herbal yield,number 1 and number 2 naked oat of Inner Mongolia Agricultural University increased respectively 45180 % and 41170 % than late mature varieties,than premature varieties 53150 % and 49110 %. In sowing dates of the second quarter,the highest yields 75 53718 kg/ ha appeared on July 20,compared with the control increased 38187 % and 76195 %. The yield of forage green naked oat double2cropping cultivation amounted to 150 000 kg/ ha. From seed production,number 1 naked oat of Inner Mongolia Agricultural University amounted to 3 78918 kg/ ha,increased 66170 % than late mature varieties and 26130 % than premature varieties.And the nutritional ingredientsof for2 age grass and seed of number1 and number 2 were higher than other oat varieties,so as the forage maize. T o sum up, choose new and premium varieties number 1 and number 2 naked oat sowed before soil thawed during the first quarter,the second quarter on July 20 as the best seeding,and use and widespread them in the production will pioneer a way for prO₂ viding forage for aquaculture industry.