Put the pre-cooled fruit baskets (boxes) on the ice for stacking. The stacks are also filled with crushed ice and stored in icehouse. Tile the cellar bottom with broken ice. The layers are filled with crushed ice. After stacking, cover the fruit pile with crushed ice, then cover it with plastic film, and then pile 70- 100 cm thick sawn wood and other heat insulation materials on the film. In this method, the cellar door must be closed, the cellar temperature should be controlled at 0- 1℃, and the door should be closed quickly when entering and leaving the cellar. Plums stored in the middle and late August can go to beginning of winter season, and can be transferred to ordinary pits to continue storage until the Spring Festival.

The air temperature is 0- 1℃, the carbon dioxide content is 7-8%, and the oxygen content is 1-3%. After removing pests and diseases and damaging rotten fruits, it was stored in modified atmosphere. (1) Controlled gas storage. The plums were sealed and stored in a polyethylene film bag with a thickness of 0.025mm.. Plums can be stored for 70 days; ⑵ Modified atmosphere refrigeration in small packages. Remove the stems from the timely harvested plums. Packed in polyethylene film bags, each bag is 1- 1.5 kg, sealed and stored at-1℃ for 2-3 months.

Prunes should be harvested within 3 hours. Only in this way can brown rot and soft rot be effectively prevented. Pre-cooling method: put the fruit into a warehouse at 0.5- 1℃ for cooling treatment. It must be refrigerated below 4-5℃ within 24 hours at the latest.

The condition of cold storage is that the temperature is 0- 1℃, and the storage temperature should be gradually increased in the later stage of storage. The relative humidity is 85-90%, and the warehouse is well ventilated. It is suggested that air disinfection should be used before plums enter the warehouse. In order to avoid pathogenic bacteria infection caused by condensation of water vapor on the fruit surface after leaving the warehouse, it is recommended to use warehouse disinfection fumigant produced by Jinan Xinkeyuan, Shandong Province.