Taking Agaricus bisporus as test material，mycelia of which were respectively covered with peat,brown loam,slurry in the process of artificial cultivation.Effect of different casing soils on fruiting time and fruitbody yield，size and quality of Agaricus bisporus were researched.The results showed that the comprehensive index of Agaricus bisporus，mycelia of which was covered with 50% peat+50% brown loam was better than those by other treatments,therefore the high yield and good quality of Agaricus bisporus could be achieved in the process of artificial cultivation by peat and brown loam being mixed in due proportion and an appropriate covering method being adopted.