Abstract: [Objective] This study aimed to prove the practicality of optional supplementary feeding scheme of Holsteins in alpine area. [Methods] The experiment was simultaneously conducted in two separate dairy farms designated as A and B. Healthy lactating dairy cows without clinical mastitis signs were selected from the dairy farms of A and B, respectively. In each dairy farm,the selected dairy cows were divided into experimental group and control group. The experimental groups in the two dairy farms were offered high quality supplementary feed, and the control groups fed traditional diet. All of the dairy cows included in this study were grazed 5 h per day. The whole experimental period lasted for 60 d, including 10 d of pre-feeding period and 50 d of formal experimental period. [Results] The daily dry matter intake of dairy cows in experimental groups in dairy farms A and B was 15.77 kg/d and 16.11 kg/d respectively, and they were obviously higher than that of their counterparts in control groups（14.02 kg/d for dairy farm A and 14.47 kg/d for dairy farm B）. In dairy farm A, the daily milk yield of experimental group（16.89kg/d） was significantly higher than that of control group（12.25 kg/d,P0.05）. In dairy farm B, the significant differences in daily milk yield between experimental group（17.22 kg/d） and control group（13.21 kg/d） were observed（P0.05）. Compared with the same period of 2014, the daily milk yield of dairy cows in the two experimental groups in present study was both significantly increased（P 0.05）. The feed cost for producing per kilogram of milk in experimental group of dairy farm A was 0.26 Yuan reduced, which is significantly higher than that in control group（P0.05）. The feed cost for producing per kilogram of milk in experimental group of dairy farm B was 0.13 Yuan reduced compared with that of control group. In dairy farm A, the content of milk fat and milk protein of experimental group were 3.95% and 3.28% respectively, which were obviously higher than those of control group respectively; compared with the same period of 2014, the content of milk fat and milk protein were increased by0.29% and 0.22%, respectively. In dairy farm B, while the content of milk fat and milk protein of experimental group was both lower than those of control group, they also reached 4.08%and 3.15%, respectively. In dairy farm A, the number of somatic cells in milk of experimental group（3.914 ×105per milliliter） was 2.140 ×105per milliliter reduced compared with that of control group（6.054×105per milliliter）, and the incidence of clinical mastitis of experimental group was reduced by 2.67% compared with that of control group.[Conclusion] These results suggest the practicality of optional supplementary feeding scheme of Holsteins in alpine area,which is helpful for improving the economic benefit of enterprises and farmers and is worthy of wide promotion.