For men aged 30 to 40 who need to prepare for pregnancy, they need to pay attention to diet, appropriate exercise, ensure adequate sleep, etc., and also follow the doctor’s prescription for medication. For men aged 30 to 40 who need to prepare for pregnancy, they need to pay attention to the reasonableness of their diet. During the period of preparation for pregnancy should be light, easy to digest and rich in nutritious food, should not intake of spicy and stimulating food, should also avoid drinking alcohol, drinking coffee or strong tea, carbonated beverages and so on. Men should also exercise during pregnancy, such as swimming, running, etc., which can help to enhance physical fitness and improve sperm quality. In addition to the above measures, men should also develop good habits during pregnancy and ensure adequate sleep. They should also pay attention to personal hygiene and wear loose-fitting, cotton underwear to prevent infections. Some men also need to take folic acid as prescribed by their doctors to improve sperm quality and prevent fetal neural tube deformities. Men in their 30s and 40s who need to prepare for pregnancy are advised to adjust their mindset to avoid excessive stress and anxiety, and to pay attention to regular medical checkups.