In order to further improve the quality of sheep and production performance, the choice of breeding sheep is of utmost importance. Therefore, when selecting, it is necessary to formulate selection criteria based on the development direction and variety characteristics. (i) Select species based on individual performance characteristics. In the primary election, the main advantages and disadvantages are determined by looking at the appearance. The selected seedlings were required to be large in size, strong in physique, well-proportioned in bones, high in legs, wide in front chest, and long in waist, and stable when climbing. The head and neck are well-integrated, with large heads and strong spirits. The reproductive system develops normally, with symmetrical testes on both sides, no disease and defects, and a strong sexual desire. This method is clear and simple. (B) According to pedigree selection. Pedigrees are important data that reflect the ancestry, performance, and rank of an individual's ancestry, and are important sources of individual genetic information. If the selected individual is good, and many of the criteria share common characteristics with the parent, demonstrating that the genetic performance is stable, you can consider seeding. In the practice of sheep breeding, data on grandparents and older ancestors are generally less considered. When comparing pedigrees, the pedigree performance level (raising rate) and hereditary stability are the main considerations. (c) According to the side quality selection. It refers to selecting the species according to the semi-sibling surface characteristics of the selected individuals, that is, by using the method of semi-sibling eigenvalues ​​with the parents to estimate the value of the selected sports species. This method is more special in the sheep industry. First, artificial insemination propagation technology is widely used in the sheep industry. The number of half-brothers born in the same period is large, and the data is easily available. Because it was born during the same period, the environmental impact is the same, so the results are also more accurate and reliable; Second, early choices can be made when the selected individuals have no offspring. (D) According to the selection of descendants. The quality of future generations is also the basis for selecting the type of ram. For rams with good individual characteristics, lambing rate, and production performance, the breeding value must be based on the quality of their offspring to make a final conclusion. The purpose of seed selection is to obtain good offspring. If the offspring of the selected ram are good, it means that the ram has high breeding value and the correct seed selection. Offspring with higher production performance, their parents generally have high production performance. If the offspring are not ideal, they cannot be left as breeding sheep. In order to choose a good breed of sheep, the breeder can generally adopt the principle of selecting and selecting the ancestors to stay in the election. After the elimination of the rams, they must castrated to prevent the pluck.