The classic formula of Cang Er Zi San is composed of Cang Er Zi, Xin Yi, Mint and Angelica Dahurica. Cang Er Zi San from the “Jisheng Fang”, the formula of Cang Er Zi for the monarch of the drug through the nasal orifices, dispel wind-dampness; Xin Yi can disperse wind-cold, through the nasal orifices, can cure the head, face, eyes and nose of the disease; Angelica dahurica main treatment of external wind-cold nasal congestion caused by headache; mint for the adjuvant, can help the above three drugs to dispel the wind and open up the orifices, but also inhibit this formula of the drug’s dryness of the drawbacks of heat, but also can be dissipated to prevent the congestion of the heat of the evil, a three-pronged approach. This formula is aromatic, warm and dispersive, and can unobstruct the lung qi. It is the main formula for the treatment of nasal abyss (mainly manifested as filthy nasal mucus, the amount of which cannot be wiped clean). Cang Er Zi San can be used not only for nasal diseases, but also for the treatment of ear orifice obstruction diseases. The contraindications and adverse reactions of this formula are not clear. Chinese herbal prescription needs to be used under the guidance of TCM doctor’s diagnosis, do not use the medicine privately, so as not to cause damage to the organism.