| Along with the development of our living condition, we need an the hot watersupply system to be more securety and continuously.because of the increase of hot water consume, the method of the hot watersupply is becoming more centralized in order to satisfy thedemand of economy, environment and to be applicable.The hot water and the watersupply second flow formula is the same in the existing criterion, and the hot water rate we choosed in the formula above is same with the rate in the formula of heat consume, that's unreasonable. First, the fixture setting, using trait and frequently between heat consume and hot water use are quite different. Second, the rate choose in these two formulas should be have their own trait. But the veicle, the law, the time and the probability that the people using hot water is deffirent from that of the water. So it should have a method.The paper presents a new method of calculation formula based on probability method with studying the Hunter'method and Russian method deeply. The principle is that making use of the foreign theories, at the same time, considering comprehensively the influencing factor of using water and using the parameter as few as possible and relating characteristic of using water with the our country's fact, gain a new method that is applicable to our country various building and simple in practice. Main contents for studying of the paper is:(1) Analysing the outcome, characteristic and the problem of the hot water supplydesign second flow method in the Europe and the USA.(2) It is determined that value frequenly of different fixture use in the period of using water high peak.(3) The relation between the N and the hot watersupply design second flow is got by applying program to computer under the different probablity.(4) Form the realation between the q_g and the N, P. (5) Drawing the chart about the hot watersupply design second flow in the 《supply and drainage criterion inside buildings》.
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