Chinese bees like new spleen and hate old spleen, and the ability of clearing nests is poor, while the nursery area is mostly concentrated in the middle and lower part of the nest spleen, so this part ages quickly and bites the spleen from the middle and lower part. Bees bite the spleen more in winter and spring. Bees bite the spleen in winter to prevent cold, which is convenient for caking, and there is no nest and spleen interval to keep warm. The purpose of biting the spleen in spring is to drive away the nest worms on the nest spleen, remove the feces and cocoon clothes left in the nest room, bite off the old part of the nest spleen and rebuild it so that the queen bee can lay eggs on the new horn spleen. Bees in China have poor ability to clean single rooms. After several generations of single-locules, cocoons were left when they emerged, and the locules became smaller and the larval development space was narrow. When they are rebuilt after being bitten through the spleen, the drone room is easy to appear at the joint. The part created after biting the spleen is different from the original spleen plane. 1 The sides of the Nested Spleen are uneven and the surface of the Spleen is irregular, which increases the workload of repairing the Nested Spleen. The ability of Chinese bees to clean nests is poor, and the wax residue dropped by biting the spleen accumulates at the bottom of the box, which is easy to breed nest worms. Management measures to prevent spleen biting: 1. Beekeeping is more than spleen or keeping spleen in proportion. Spleen should be no more than bees; Second, when overwintering, put the complete nest spleen on both sides, with half spleen in the middle, which is convenient for bees to agglomerate; Third, when breeding in spring, cut off the lower part of the nest spleen and let the bees rebuild the spleen; Fourth, make full use of the honey source period to build more spleen and replace and eliminate the old nest spleen in time. Mesenchymal spleen can be used for up to 2 years.