In order to relieve the cold stress of beef cattle and increase the beef production efficiency during winter in Northwest China, a comparison study was conducted to evaluate the performance and the economic viability of the constant temperature water supply system. Simmental crossbreed cattle was used as experiment animal, and the temperature inside the constant temperature water supply system, the drinking behavior and the physiology of the beef cattle, and the growing performance were determined. This experiment was conducted in 2 barns with pitched roof in Zhangye area of Gansu Province, China. In the study, the control group was fed with cold water once a day, and cows in the treatment group were constantly supplied with warm water and divided into 4 groups according to the degree of thermal insulation means. The constant temperature water supply system used in this experiment contains heating tank (with heating rods and float inside), temperature controller, 29 drinking cups (2 kinds, insulation drinking cups with insulation material interlayer and single-layer drinking cups without insulation), and water supply and return pipe (2 kinds, insulation pipes with insulation material interlayer and single-layer pipes without insulation). The float inside the tank can control water level in the tank and drinking cups. Temperature probe connected with temperature controllers can set the upper and lower limit of temperature. When the temperature in the tank is higher than the upper limit of temperature, the heating rod stops heating. And heating rod starts heating when the temperature is below the lower limit of temperature. During this experiment period, the time interval of water drinking was recorded by using the behavior monitor and the water temperature was measured as well. Record the behavior of every single cattle, and count the drinking time every 10 minutes to study the relationship between drink behavior and water temperature. The body surface temperature nearby rumen was measured for those cattle which were monitored. Meanwhile, the thermal insulations of these 4 groups were compared, and the relationship between the water temperature and the drinking behavior and the daily body weight gain of the beef cattle was explored. The results showed that the constant temperature water supply system supplied with warm water at 17.69℃ using the thermostatic drinking system, and the daily body weight gain by drinking warm water was 1.53 kg/d per cattle, which was significantly increased by 0.36 kg/d per cattle compared to cattle from the control barn (P<0.01). In the treatment barn, cattle drunk more and had higher body weight gain in the group with warm water at 16-18℃(the daily body weight gain was 1.69±0.44 kg/d per cattle). The rumen surface temperature of the treatment group after drinking water was 3.29℃ higher than the control group (P<0.01). Through calculation, the economic performance of 4 groups (A, B, C and D) with the warm water supply system and the control group could obtain profits of 3732.5, 3109.9, 2890.1, 2875.4 and 2632.5 yuan on average, respectively, for every cow in one winter. Thus, Group A showed the highest profit. In conclusion, the study shows that the constant temperature water supply system can effectively relieve the cold stress and thus significantly improve the production performance of beef cattle, and it has the technical and economic feasibility.%为缓解西北地区拴系肉牛在冬季产生的冷应激，提高肉牛生长性能，研究根据连通器原理设计恒温饮水系统，为牛只提供温水。试验选取西门塔尔牛作为试验牛，对饮水器内水温、肉牛的饮水行为、生理以及日增质量进行测定。试验结果表明：恒温饮水系统能为处理组牛只提供17.69℃的温水，处理组牛的日增质量为1.53 kg/(d·头)，较对照组提高0.36 kg/(d·头)，差异极显著（P＜0.01）。在处理组中，牛只饮用16～18℃的温水表现出更多的饮水次数和更好的增重效果（日增质量达到(1.69±0.44) kg/(d·头))。饮水后牛只瘤胃处体表温度处理组比对照组高3.29℃，差异极显著（P＜0.01）。结果表明，在拴系肉牛舍中采用这种恒温饮水系统能够有效改善肉牛因冬季饮用冷水造成的冷应激，并能显著提高肉牛生长性能，具有技术和经济可行性。
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