Pollen is one of the essential foods for bees. It is a natural source of protein, fat, vitamins and minerals for bees. All larvae and young bees mainly rely on the nutrients in pollen to grow and develop. . Without pollen, larvae cannot grow, young bees cannot develop, and bee colonies cannot produce royal jelly, beeswax and other products. Each time a bee is fed, an average of 145 mg of pollen is consumed, and 1.5 kg of pollen is sufficient for the normal development of 10,000 worker bees. The reproduction and production development of bee colonies lacking pollen will be greatly affected.