Men should pay attention to nutrition during pregnancy preparation to ensure the vitality and quality of sperm, mainly the following points: 1. consume more high-quality protein, because protein can improve the quantity and quality of sperm, which can be obtained from lean meat, animal liver, dairy, eggs and other foods; 2. minerals and trace elements are also needed to be supplemented by men during pregnancy preparation. These elements have an important impact on male fertility, for example, zinc can maintain the normal spermatogenic function of men, once men lack zinc, it will lead to a decrease in the number of sperm, decreased vitality, poor liquefaction of semen, and even infertility, so we should eat more beans, peanuts, millet, radish, cabbage and other zinc-supplemented foods; 3. It is recommended that men avoid local heat injury, balanced diet, during pregnancy preparation It is recommended that men should avoid local high temperature injuries, have a balanced diet, regular rest and rest, stay away from smoking and alcohol, etc., eliminate drugs, and enhance physical exercise, strengthen physical fitness and avoid bacterial infections, etc.