Dry red wine is completely fermented from grapes, and its sugar content is less than 4g/ l. Sweet red wine is incomplete fermentation of grapes, which contains some sugar; The sugar content in wine is greater than or equal to 50g/L sweet wine. Semi-sweet wine with sugar content less than 50% and more than 4%,

The production of sweet wine abroad generally adopts three methods:

1, sugar-free fermentation requires high sugar content in grapes.

2. Sugar fermentation method,

3. Method of retaining part of glucose: add practical alcohol or brandy according to the standard during the main fermentation, and stop the fermentation when the fermentation reaches the predetermined goal.

In China, it is usually made with sugar. .