Abstract: This paper analyses internal relations between various earth's surface and sowing re-sults,and puts forward the criteria of sowing-aera selecting.Grassland types are classified through analyses of fuzzy cluster,and the types of seed mixing and quantity of sowing are obtained.The aerial mixed sowing technique of chessboard and repeated model is used in the study to increase the evenness and result of sowing.The mixed seeding grassland set by plane has fundamentally changed the prairie landscape of simple Astragalus adsurgens pall,and it has achieved obvious benefits.