A child’s allergy can only be improved by desensitization therapy at present, while the chances of allergy occurrence may be reduced to some extent by allowing the child to exercise more and improve the diet. A portion of them can be gradually relieved naturally. Allergic constitution is a kind of specific constitution, mainly refers to the frequent occurrence of allergy or allergic diseases, but it is more difficult to determine the cause of the disease, mainly due to genetic factors. Currently, there are fewer clinical treatments for allergies, and only desensitization therapies may be able to improve the condition. Parents can first take their children to the doctor for allergen testing to identify the specific causes of allergy in their children, and then through allergen injections or sublingual administration of allergens, start with a small dose to allow the child’s body to tolerate the allergen, and then gradually increase the dose to induce the child to tolerate the allergen without having an allergic reaction, but there are large individual differences in the specific effects. In addition to the above desensitization therapy, parents can also allow their children to do more running, hiking and other exercises, and usually pay attention to improve the child’s diet, give the child more vitamin-rich fruits, vegetables, etc., to ensure that the child’s nutrition is balanced. The above methods can play a role in strengthening the child’s immunity and resistance, and may have a certain effect on the tolerance of allergic reactions caused by re-exposure to allergens. To summarize, there are fewer ways to improve the allergic body, if the above methods are not effective, parents should pay attention to avoid exposing their children to allergens again.