The first is the seriously infected cottonseed, withered, verticillium is one of the stubborn diseases restricting cotton yield, cottonseed is the carrier of bacteria. The disease can spread rapidly with cotton seeds. Therefore, the cotton seed in the area of severe wilt and verticillium wilt cannot be transferred into the disease-free cotton area. The second is the cottonseed of peach and peach in late autumn. In the early and late autumn peaches, the growth was poor, the maturity was poor, the boll weight was light, the seed germination rate was low, and the growth was fragile. The third is to strip the peach cottonseed, some cotton farmers on the development of more fully Fu peach, still have the bad habit of stripping peach. Where the cottonseed of the peach blossom is peeled, it cannot be brought to the market because it is not fully mature and has not completed the ripening effect. Fourth, cotton seed sprayed with ethephon. Although the application of ethyleneyl can promote the early ripening of cotton for 3~4 days, it has great damage to cotton seeds, resulting in incomplete development and can not be planted. Fifth, the seriously degraded varieties. Cotton is a cross-flower crop, the outcross rate is about 8%, some cotton farmers have not replaced new varieties for many years, cotton seed purity is only 70% to 80%, serious quality degradation, continued use will lead to production reduction, quality decline. Sixth, cotton seeds stored with pesticides and fertilizers. Some farmers store cottonseed with pesticides and fertilizers in a warehouse for a long time and have poor ventilation. Due to the toxic gas from pesticides and fertilizers, the normal physiology of cottonseed is damaged, and the germination rate is sharply reduced. Seven is stored too old cottonseed. The germination rate of cotton seed stored for half a year is generally more than 80%, and the life and storage age of cotton seed show a negative increase in the case of no low temperature refrigeration equipment. Eight is dried cotton seeds in the cement yard. When the cotton seeds with high water content are sun-dried on the cement soil, the physiological function of the cotton seeds is disturbed due to the strong respiratory intensity, and some cotton seeds form dummy seeds and lose the germination ability. Nine is heavy mechanical damage cottonseed. The mechanical damage rate of finished coated cotton seed should be controlled within 2%. Cotton seeds with a broken seed rate of more than 2% are heavily impregnated by drugs, which has a great impact on germination rate. If the broken seed rate is too high, it is not suitable for seed use.