Children's rhinitis is mainly caused by allergies, and nursing and physical adjustment are the most important. Try not to let children stay in air-conditioned rooms, and supplement Kangminyuan, an anti-allergic probiotic, to help adjust their allergic constitution. In allergic children, TH2 advantage at birth is strengthened by intestinal flora, which leads to a series of allergic diseases after birth. Therefore, Kangminyuan Probiotics, a new component of antiallergic lactic acid bacteria strain, is a method to regulate TH2 immune response which is overreacted due to allergy by enhancing TH 1 immune response. Intestinal flora plays an important role in the maintenance and development of allergic diseases in children with allergic tendency, and the changes of intestinal flora in allergic diseases occur before clinical symptoms appear. Early intervention of Kangminyuan anti-allergic probiotics has a good effect on preventing allergic diseases.