Abstract: To study the effects of regulated feed on milk production and milk composition of dairy cows, 10 dairy cows with the same age ,fetal times, milking days and milk production were selected and divided into two groups in accordance with the paired experimental design. The dairy cows in control group were fed with the basal diet and that in test group was fed with the basal diet added with the regulated feed. The results showed that the daily milk yield of each dairy cow in test group increased 1.366 kg than that in control group （P〈0.05） and the contents of milk protein, milk fat, lactose, dry matter in dairy cows in test group had no significant difference with that in control group. Through the contrast before and after the test, it was seen that regulated feed significantly improved milk production of dairy cows.