This experiment was carried out to find out the most effective combination of gross mixture which could be sufficient the seasonal requirement for the nutreint to milking cow and increase the yields. The testing was done at the grassland of the Korea Newzealand co-operated dairy ranch at Pyeongtaeg, Kyenggi province. After sowed as Table 2, the relation between the seasonal requirement for the nutrient to milking cow- and yields of the green grass and hay was studied. The results obtained were summarized as follows; 1. The green grass yield 2,748㎏ on mixture grassland of orchard grass, ladino clover, and alfalfa in the first year. It the yields from mixture grassland of orchard grass and ladino clover was considered as 100, this was the highest gelds, and mixture grassland of perennial ryegrass, orchard grass, red clover, white clover, Italian ryegrass, and timothy gave the least yields. 2. The mixture grassland of perennial ryegrass, Italian ryegrass, orchard amass, red clover, timothy, and white clover suffered the most summer depression, but the mixture grassland of orchard, grass, ladino clover, and alfalfa yielded much green grass without summer depression. 3. The mixture grassland of perennial ryegrass, Italian ryegrass, orhard grass, red clover, timothy and white clover contained 2.59% of the crude protein. and 2.9% of the crude fiber. The mixture grassland of orchard grass, ladino clover, and alfalfa contained 3.26 of the crude protein. 4. In comparing the seasonal requirement for the nutrient to milking cow to the yields of green grass, hay, and the crude protein, the mixture grassland of orchard grass, ladino clover, and alfalfa gave the highest productivity on July and August, and sufficed the seasonal requirement for the nutrient to milking cow that gave birth on February and March.