It is estimated that one out of every 20 people in the world has asthma, about 300 million people. It is estimated that there are nearly 20 million asthma patients in China. The incidence rate of asthma worldwide is increasing, especially incidence rate of children. Asthma is a chronic disease which has obvious influence on patients, their families and society. Common symptoms are paroxysmal wheezing, shortness of breath, chest tightness or cough. A few patients may also experience chest pain. These symptoms often occur in patients after exposure to smoke, perfume, paint, dust, pets, pollen and other irritant gases or allergen. Symptoms at night and / or early morning are also prone to occur or aggravate.

Fortunately, asthma can be controlled as long as patients receive timely and correct diagnosis and long-term standardized treatment and management based on inhaled corticosteroids. According to an international study, the control rate of asthma is close to 80% after the fixed dose escalation and maintenance treatment of fluticasone / salmeterol. Although from the perspective of patients and society, the cost of asthma control seems to be high, and the cost of incorrect treatment of asthma will be higher.

Aerosol inhalation therapy plays a very important role in the treatment of children's asthma. The biggest advantage of inhalation therapy is that the drug can act directly on the target organs with high concentration, high local drug concentration and good effect.