Men who are preparing for pregnancy should quit smoking and drinking for at least three months, and if they have been smoking and drinking for a long time, the time for quitting smoking and drinking needs to be extended appropriately. Because the normal male sperm production process takes about three months, so men to prepare for pregnancy at least three months to abstain from smoking and drinking. However, in the case of long-term smokers and drinkers, the period of time should be extended to about six months. If the time is too short, it may affect the quality of sperm, and also have a certain impact on the quality of the fetus. In addition to preparing for the process of pregnancy, in addition to prohibit smoking and alcohol, men in the preparation for pregnancy, but also should minimize chemical exposure or exposure to pollutants, which can protect the testicles spermatogenic function normal Men should also pay attention to maintain a pleasant mood, healthy diet, change bad habits, strengthen physical exercise, ensure adequate sleep, avoid staying up late, which can improve the quality of sperm to a certain extent. Men can prepare for pregnancy under the guidance of the doctor, and go to the hospital in time for examination to determine the quality of sperm.