[Objective] Two key techniques of mulberry wine fermentation that bacterial strain selected and polyphenol oxidase inactivated were studied,in order to provide technical support for the establishment of stable fermentation technology of mulberry wine. [Method]The yeast were enriched,cultured and selected from mulberry and mulberry field. The effects of pH and temperature on the activity of polyphenol oxidase were studied. [Result]2 kinds of mulberry wine fermentation special yeast were obtained. The two yea...