Objective: To strengthen the improvement of livestock breeds and promote the quality improvement and efficiency improvement of animal husbandry. Significance: It can adjust the structure of sheep and relieve the pressure of sheep on grassland. In Aheqi County, artificial insemination of core ewes is a powerful starting point for breed improvement. By selecting high-quality breeding sheep, centralized production and batch feeding, the labor intensity and cost are greatly reduced. By establishing the core group to better organize and manage the production and operation of the whole flock, the breeding and lambing time of the flock can be concentrated at a fixed time, which is conducive to unified management and production and operation.