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Black jujube is also processed by fresh dates, the technical points are as follows: 1, the choice of raw materials: the choice of large, small nuclear fleshy hypertrophy, less juice, fresh and ripe fruit as raw materials, pick to break the date, bad date. 2. Classification: According to the size of the fruit, maturity, species treated separately. 3, hot cooking: The water into the pot boil, pour fresh dates heating 5 to 10 minutes. Cook until the flesh is slightly soft, remove it and allow it to be smoked. 4, smoke preparation: Dig deep in the ground 180 cm, width 160 ~ 200 cm, the appropriate length of the pit, away from the pit 50 cm near the scaffolding with bamboo or bamboo, piled on the shed face date fruit. 5, smoked: jujube fruit piled on the shed, generally 13 to 16 cm thick is appropriate, too thick not to be dry, too thin to waste firewood, jujube fruit above the use of carpet cover, in the bottom of burning firewood, jujube layer temperature control 60 to 70 degrees Celsius. Pay attention to adjusting the size of the firepower. After smoking for about 12 hours, turn the jujube up and down again, and continue smoking for 12 hours to complete the smoking phase and prepare a pit. Jujube rate is 30 to 33% of fresh dates. 6, soft: In order to make the moisture content inside and outside jujube fruit uniform, smoked jujube must be stacked in a relatively dry and ventilated warehouse, the height is generally not more than 1 meter, after 7 to 10 days can be out of the library packaging. 7. Classification: The jujube of the same variety is classified by size of head and dark jujube. 8. Packing: Most of them are packed in sacks, or packed in cartons. Pay attention to ventilation. 9, quality requirements: (1) requirements of dried dates, jujube meat solid, pinching the deformation, not peeling. (2) The black jujube skin is bright and shiny, and black is red. (3) The particles are large and uniform, short and round, and the skin wrinkles are fine and shallow. (4) It is better to use lighter yellow flesh, solid and detailed flesh, small nuclear and sweet taste.