Alcohol consumption by men during pregnancy preparation can have an impact on pregnancy. First of all, alcohol in wine will stimulate sperm and reduce sperm quality, and in serious cases, it will cause sperm malformation, reduced sperm motility and increased dead sperm rate, which will have a direct impact on pregnancy. Secondly, men who often drink alcohol are prone to prostatitis and inflammation of the reproductive tract, which will indirectly affect pregnancy when the inflammation worsens, and prolonged drinking will lead to a decline in androgens in the body, causing sexual dysfunction, making ejaculation difficult and affecting pregnancy. For men who are planning to have children, they should quit smoking and drinking 3-6 months in advance, because the male sperm production and development cycle is about 3 months, and avoid smoking, as harmful substances in cigarettes such as nicotine can also cause sperm deformation or death. And men should develop good living habits during pregnancy preparation, go to bed early and wake up early, and exercise, which can help to improve sperm quality.