Frequent exposure to radiation is likely to cause “harelip”. The exact cause and pathogenesis of cleft lip and palate is not yet fully understood, but it is generally believed that cleft lip and palate is mainly caused by both genetic and environmental factors. Environmental factors: mainly refers to the first 3 months of pregnancy, when the mother’s physiological state is attacked or disturbed, it may affect the fetal facial growth and development, such attack mainly refers to improper medication, frequent exposure to radiation and viral infections. For example, vomiting or partial eating during pregnancy can affect the intake of nutrients. It is especially important to note that women with alcohol and smoking habits must stop smoking and drinking before pregnancy. The first 3 months of pregnancy is an extremely important period for pregnant women to avoid all bad mental stimulation, avoid exposure to radiation and trauma, and never take the decision to use medication on their own, and older women should especially strengthen their health care and monitoring during pregnancy. Genetic factors: Many patients with cleft lip and palate have been found to have similar deformities in their immediate or collateral relatives, and thus it is generally accepted in medicine that cleft lip and palate deformities are genetically related. The older both mothers are, the higher the risk of congenital harelip in their children, and the risk of harelip in newborns is 20 percent higher in 40-year-old mothers compared to 30-year-old mothers. The basic requirement of cleft lip and palate repair surgery is to restore the normal shape and function of the lip and nose as much as possible. The normal lip and nose have the following characteristics: the nostrils on both sides are equally round and large, the nasal tip and nasal column are centered, the nose is not collapsed, the two upper lips are equal in height and symmetrical, the red lips are full, the lip beads are slightly protruding, and the red edge of the lips is bowed. The timing of cleft lip and palate repair surgery is also important, the younger you do it, the better it is for recovery. Under normal circumstances, it is generally considered that 3 to 6 months would be a better time to do it. Experts have excellent surgical cases and treatment techniques for cleft lip and congenital harelip caused by various reasons.