1, oxygen and lactic acid bacteria are anaerobic bacteria and must be separated from the air.

2, temperature, the optimal growth temperature is 30~40℃, and the summer temperature is just right.

3, nutrients can not be less. In order to grow vigorously, some sugars, such as white sugar, brown sugar, glucose and so on. Can be added at the initial stage of fermentation to create the growth advantage of lactic acid bacteria;

4. Prevent contamination by miscellaneous bacteria.