Because of the delicate internal organs and the lack of vitality, children are prone to feel external evil and get sick, mainly due to weakness, wind, occasional fever and cough, and easy sweating. As stated in the “Three Character Classic of Medicine”, children have “tender skin and timid energy, and are easily touched”. It is recommended to take Yu Ping Feng San or use it as a basic formula to improve immunity, eliminate symptoms and prevent recurrence. It is composed of three herbs, namely Astragalus, Atractylodes and Bifeng, and has the function of benefiting Qi and fixing the surface, dispelling evil and stopping sweating. It is mainly used for treating Qi deficiency, spontaneous sweating and body deficiency colds. According to Chinese medicine, patients with recurrent colds are suffering from deficiency of lung qi, the lung is in charge of the couples and the couples are on the surface. In the formula astragalus is the first medicine, has the benefit of Qi solid table function, to resist the wind evil not to take advantage of the effect of deficiency; with fried white atractylodes easy raw white atractylodes, weaken the dryness, the function of partial supplementation of Qi to strengthen the spleen, in order to fund the source of water and grain, help astragalus benefit Qi solid table to stop sweating as the first medicine; anti-feng go table to dispel the wind evil, as the auxiliary, lead the medicine to the coup, so that the medicine in the coup to play a role in the actual table, so as to play a role in the prevention of colds. It is like a screen to surround people, so that people are protected from the attack of wind and evil, to avoid the occurrence of colds and flu and named. Modern pharmacological research shows that Yu Ping Feng San can regulate the immune function of human body. Some studies also suggest that one of the reasons why it can treat recurrent respiratory tract infections in children is that most children with recurrent respiratory tract infections have low levels of the trace element zinc, and Yu Ping Feng San has a certain effect of zinc supplementation and regulation of the body’s immune function. In addition, reports show that Yu Ping Feng San can also treat primary thrombocytopenic purpura, oral ulcers, chronic urticaria, Meniere’s syndrome, Coxsackie B virus myocarditis, chronic colitis, facial nerve palsy, bronchial asthma, allergic rhinitis, pruritus, habitual constipation, primary hyperhidrosis, etc.