(1) A large amount of Pleurotus ostreatus and uneven sowing will lead to the appearance of Pleurotus ostreatus. Therefore, the sowing amount should be controlled at 0.2 ~ 0.3 kg/m2. Sowing methods can be layer sowing, mixed sowing or broadcast sowing, and it is best not to use hole sowing. (2) Strain aging If aging strains are used, although the mycelium germination and colonization are normal, the yield of the first tidal mushroom is better, but the yield of the second and third tidal mushrooms is obviously reduced, and the overall yield is reduced. So when you buy strains, you must pay attention. (3) The temperature difference is too large, which leads to the death of small mushroom buds. During the fruiting period of Volvariella volvacea, ventilation and water spraying management must try to keep the cultivation environment constant, ventilation can only be carried out slowly, and pay close attention to the sudden change of climate. It is forbidden to open windows for ventilation in windy days. When spraying water, you should also pay attention to the fact that the water temperature used is consistent with room temperature. (4) In the acidified culture medium, the hyphae grow thin and weak, with no luster, and the fruiting bodies are few and small, which is easy to break the membrane and open the umbrella, while the ghost umbrella occurs in large numbers. In order to prevent acidification, we should not only pay attention to adjusting the pH value when preparing culture materials, but also change the water management after sowing to spraying 0.5% lime water. (5) Too loose culture materials collapsed seriously. Collapse often leads to mycelium breakage, thinning of culture materials and decline of mushroom yield. Therefore, after sowing in bed, we must pay attention to slightly compacting the culture material. If it is a heap cultivation method, the heap shape should be low rather than high. (6) Incomplete pretreatment such as fermentation, pest disinfection, etc. with deteriorated raw materials or culture materials, or cultivation in unsanitary places, can lead to a large number of miscellaneous bacteria and pests, resulting in a large number of dead, stiff or deformed young mushrooms on the bed surface.