It has many characteristics such as promoting mucus exclusion function and dissolving secretion and can also promote the exclusion of thick respiratory tract secretions and reduce mucus retention, promote expectoration and improve the breathing Applicable for the acute and chronic respiratory diseases accompanied with abnormal mucus secretion and poor expectoration function, such as: Chronic bronchitis acute exacerbation, asthmatic bronchitis and bronchial asthma expectorant treatment; Pre-treatment of idiopathic pulmonary complications