1. Disinfection, all instruments are disinfected. Then add the prepared milk, 200ML warm water and 30 g whole milk powder, and add 125 ml yogurt. 2. Put it in the yogurt machine for eight hours a night, get up and unplug the power. It's so thick, like tofu, white and odorless. It tastes a little yogurt, but it's weak. If the milk is produced for a long time, it will not be so thick if 400ML of milk is made and 60 g of milk powder is added for eight hours. It can be sent for a longer time. 3. Add sugar, honey and jam according to everyone's taste. Put the rest in the refrigerator, and it will taste better when you go home in the afternoon. There are several points to emphasize here: firstly, disinfection must be done, otherwise it will not be done, and probiotic reproduction will not be successful. Second: use whole milk powder, skim or low-fat milk powder, which succeeded, but the effect was not good. The advantages of making yogurt with milk powder are low cost, sanitation and convenience. If you buy boxed milk and yogurt, the calculation cost is similar to buying yogurt.