Black tea is generally 70-80 degrees is best for Iron Goddess of Mercy is generally 80-90 degrees is best for Green tea is generally 80-90 degrees is best for Amino acids in tea are good for the human body, it can be dissolved at a water temperature of 6 ℃. Vitamin C is damaged when the water temperature is 70 degrees Celsius. Tea polyphenols and caffeine are gradually dissolved out when the water temperature is 70 degrees C. If the water temperature is too high, the flavor of tea will be too bitter. Therefore, in order to maintain the nutrition in the tea, so that the tea flavor fragrance, tea water temperature is best between 70 ℃ to 80 ℃ is appropriate, generally is the first boiling water into the thermos, and then make tea is better. The water temperature can be slightly lower for good raw puerh, but according to my feeling, the effect of water temperature on the flavor of puerh is not very obvious. Brick tea can not be made with cold water, because when the tea is brewed, it should be spoiled.