It is no problem to make tea with a thermos cup, but the thermos cup generally has a good insulation effect. Long-term high temperature will make the aromatic substances in tea volatilize rapidly, thus reducing the proper aroma. However, when we make tea, we often use boiled water. The insulation function of the thermos cup is very strong, which will reduce the efficacy of tea. Tea is rich in vitamins and minerals such as protein and fat, and it is a natural health-care nutrition. Long-term high-temperature foaming will not only reduce the pharmacological effects of tea, but also reduce the efficacy of tea. Making tea in a thermos cup will not only affect the taste, but also make tea contain so many harmful substances. It not only reduces the nutritional value of tea, but also increases the accumulation of harmful substances. Vitamin C and other nutrients in tea will be destroyed when the water temperature exceeds 80℃, and it will lose too much when soaked in high temperature for a long time, which will reduce the health care function of tea. So in the process of drinking tea, we usually use standard tea sets to make tea. When making tea with a standard tea set, the second cup of tea is often used, and the first cup of tea is often used to clean and wet the cup. So we don't recommend making tea in a thermos cup. You need to drink delicious tea, you need to brew it with ceramics or teapot cover tea set, and you can't use a thermos cup. After all, the harm of making tea in a thermos cup is also very great. The thermos cup is suitable for filling water to keep warm, but not for making tea.