Before men prepare for pregnancy, they should pay attention to do pre-pregnancy examination, quit smoking and quitting smoking, balanced nutrition, and avoid hurting testicles. 1. Pre-conception examination: men should also go to the hospital to do pre-conception examination before preparing for pregnancy, such as semen routine, reproductive system ultrasound examination, hormone six examination, biochemical examination and other items. 2. Quit smoking and smoking: men should quit smoking and drinking during the preparation for pregnancy, long time smoking and drinking will affect the quality of sperm. This will increase the probability of sperm deformity and reduce the success rate of female fertilization. 3. Nutritional balance: men should do a balanced nutrition during the preparation for pregnancy, meat and vegetables should be appropriate combination, eat more fresh, hygienic food, should not overeat, maintain weight within the normal range. 4. Avoid hurting testicles: men should protect their testicles and avoid doing things that hurt them, such as hot tub baths, saunas, and avoid wearing tight underwear. Stay away from rays and drugs to avoid causing sperm quality changes and deformities to occur. Men should prepare for pregnancy under the guidance of a doctor.