2. The coffee machine must be preheated. Only when the steam temperature and pressure of the coffee machine are under certain conditions can delicate milk foam be made.

3. Milk must not be foamed milk. It can be cooled and mixed with new milk.

4, milk can be poured into the half of the milk tank, not too much or too little, too much will overflow, too little will not do.

5. The distance between the steam nozzle and the milk cylinder wall shall not exceed 1cm, and the steam nozzle shall be exposed when it enters the milk.

6. Turn on the steam and let the milk rotate in one direction. When the amount of milk foam is enough and the milk foam is fine enough, it will be ok.