In recent years, in order to adapt to the residents' dietary structure adjustment and consumer demand for lean pork, and continuously raise the industrialization level and aquaculture efficiency of the pig industry, the pig breed has been improved rapidly, and the ternary price of the commodity pigs has increased. The goal is to promote dual sows to gradually become the main body of fertile sows. However, relative to the soil species (local breeds), the sow sow modified and improved with the introduced pig breeds showed a change in reproductive physiology compared with the local breed sows, mainly due to the delay of the puberty period and the characteristics of the estrus. Minor, it is difficult to determine the appropriate breeding time. The clinical manifestation is that breeding is not easy to be affected by the fetus and the fertility rate in the affection period is relatively low, which affects the efficiency of pig raising and the enthusiasm of breed improvement, and has become one of the limiting factors for the development of the pig industry. First, we must do a good job of feeding and management. Compared with native sows, sow sows have a large body size and consumes large amounts of nutrients, especially for farrowing sows. The birth of three-yuan piglets is a major birth. The amount of sucking milk is large, and the lactation consumes the nutrient reserves of the body. To restore sensation, high demand for nutrition. In order to maintain good reproductive performance and proper sensation, neither fat nor too thin. Therefore, we must strengthen feeding and management, especially the arrangement of diets, to do, feed formula science, reasonable feeding, and conditional best to arrange some green feed and juicy feed in the diet. In order to ensure quality, feed turnover is faster. Second, we must attach importance to heat identification. In order to catch the best time for breeding, estrus identification can adopt the "one-see, two-listen, three-click" method, that is, to see the sow's vulvar changes and behavior changes, listen to the sow's cry, and press the estrus sow's back. . In the case of estrus in the sow, the main performances are as follows: The earliest vulva swells, but the insemination should be controlled when the swelling of the vulva subsides until there is a pronounced fold, which basically returns to the condition before the estrus. At the same time as the puke is swollen, the color also changes, and gradually fades in the middle and late stages. It is advisable that the insemination period be appropriate for the recovery of the color of the vulva near normal time (pink). In addition, in the early stage of estrus, the sow of the two sows had less vaginal mucus secretion, a slight white color, a short duration, and gradually increased afterwards. The thin water sample became transparent again. This symptom maintained for a long time; later, the thickened and changed. Less, when the vulva's end is almost no more mucus, insemination is more appropriate. Most of the changes in behavior are quiet, and a few are excitatory and recessive. In the early stages of estrus, the performance of the estrus was disturbed, walked, and slightly crawled; in the middle and late stages, it was dazed and standing, and it was sensitive to sound stimulation. In early stages of estrus, squeaking noises often occur. The sound is short, low, low, and intermittent. Be aware of it. After the estrus was pressed, the back showed a "dwelling reaction." The identification of the initial estrus of gilts is generally difficult, and special attention should be paid to observation. Once a suspected situation is found, it is in sight. Adhere to many times a day, observations should be combined with the age of the sow for comprehensive analysis, conditional adoption of boars, can greatly improve the accuracy of the judgment. Third, we must put a good quality semen. The quality of boar semen is particularly important in the mating of sows. This is mainly due to the characteristics of the sow's own characteristics. The external characteristics are not obvious during estrus and it is difficult to judge and identify. Therefore, the breeding time is difficult to grasp. The superiority of high-quality semen in vitality and survival time enables measures to increase the conception rate through multiple inseminations. At the same time, quality breeding pig semen is also a need for variety improvement. Therefore, attention should be paid to semen identification prior to insemination, and the use of natural mating methods must be able to grasp the age and health status of the boars, especially the recent mating, and ensure that boars have enough rest. Fourth, to increase the amount and frequency of insemination. The use of artificial insemination can increase the amount of insemination in the breeding period. It can be started in two ways: first, increase the amount of insemination in a single time. In general, the amount of insemination should be in the range of 60-80 ml; the second is the increase in insemination. The number of times, starting from sows receiving insemination, insemination once every 8-12 hours, continuous insemination 2-3 times. If conditions are met by natural mating, compounding can increase the conception rate. 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