Pleurotus eryngii is a low-temperature grass-growing fungus or wood-borne white rot fungus, which has a strong ability to decompose lignin. In nature, the main nutrient substrates of Pleurotus eryngii include broad-leaved trees such as Zelkova schneideriana and Aesculus chinensis. Due to the improvement of cultivation techniques, only sawdust such as Cryptomeria fortunei and pine trees can be used to cultivate seafood mushrooms. When using conifer sawdust alone to cultivate marine mushrooms, we should pay attention to the accumulation and fermentation degree of sawdust and the distribution of sawdust thickness. Also pay attention to the types and dosage of auxiliary materials (nutrients). These factors are just suitable for the cultivation of seafood mushrooms. It takes at least 6 months for conifer sawdust to accumulate outside the house, during which water should be sprayed and turned over 3-4 times. This can not only dissolve and remove polyphenols and resins contained in sawdust that hinder the growth of Pleurotus eryngii mycelium, but also promote the softening of sawdust and absorb enough water through microbial decomposition. Therefore, by keeping a large amount of water in the cell wall of wood treated with sawdust (water in which hyphae can be easily utilized), a sufficient gap can be ensured in the culture of Pleurotus ostreatus. Wood chips of broad-leaved trees will decompose and rot when piled outdoors for a long time, so they are not suitable as raw materials for the culture medium of seafood mushrooms. Therefore, a roof must be built to prevent sawdust from getting wet. Generally speaking, hardwood sawdust and conifer sawdust are mixed, but it changed from hardwood sawdust: conifer sawdust 2-3: 1 to hardwood sawdust: conifer sawdust 1: 2-3 about 5 years ago. This is not only due to the soaring price of hardwood sawdust, but also due to the development of various auxiliary materials (nutritional additives). The thickness of sawdust is very important to ensure the porosity of culture medium. Fine sawdust reduced the porosity of the culture medium, which led to the slow growth of Pleurotus eryngii mycelium, delayed the physiological maturity of mycelium and affected the growth of mushroom buds and fruiting bodies. The sawdust is too thick, the water retention capacity of the culture medium is poor, and the culture medium is easy to dry. Therefore, it is hoped that the thickness of sawdust can be used appropriately. In areas lacking wood resources and most of the closed areas for afforestation, agricultural and forestry products such as rice straw, wheat straw, cottonseed hull, corn cob and crop straw are mostly used as carbon sources for artificial cultivation. Because corn cob contains a lot of sugar (carbohydrate), it can be used not only as raw material of culture medium, but also as nutrient source (nutrient source additive). Taking rice bran, wheat bran, soybean powder, corn powder and cottonseed powder as nitrogen sources, trace elements can promote the growth of mycelium. In cultivation production, cottonseed hull and corncob (powder) are good raw materials for culture medium, and adding auxiliary materials such as bran and corn flour is beneficial to improve yield and quality. Experiments show that the yield of culture medium added with corn flour is significantly increased, but it should not be too much (not more than 6% under normal circumstances), otherwise it will easily cause a large number of miscellaneous bacteria pollution in the fungus bag. The ratio of carbon to nitrogen in the culture medium is 30-34 ∶ 1, and the optimum ratio of carbon to nitrogen is about 32∶ 1. The cultivation technology of Pleurotus ostreatus consists of making culture materials, bagging, sterilization, inoculation, spawning (culture), promoting germination and developing fruiting bodies. [ 1