Precautions and preparations for men who are preparing for pregnancy, including routine semen test, adjusting daily diet, improving bad habits, and adjusting life routines. 1. Routine semen test: During the preparation period, men should consult a doctor for a routine semen test to clarify whether there is any abnormality in sperm quantity, quality, deformity rate and other indicators. 2. Adjust the daily diet: during the preparation for pregnancy, you should adjust your daily eating habits, eat less spicy and greasy food, eat more fresh vegetables and fruits, ensure balanced nutrition, and do not favoritism and picky eating. 3. Improve bad habits: during the preparation for pregnancy, men should improve some bad habits, quit smoking and drinking, do not stay up late, do not play computer and cell phone for a long time, and do not use medication arbitrarily after illness. 4. Adjust the routine of life: to adjust the daily routine of life, go to bed early and get up early every day, more physical exercise, to enhance their physical fitness and immunity. In addition, during the preparation for pregnancy, women should also do a good job in all aspects of care, only the husband and wife to cooperate with each other, in order to be able to eugenics.