Bronchial asthma is a common chronic respiratory disease. Patients with mild asthma account for more than half of the total asthma population. The diagnosis of mild asthma is much more difficult because the symptoms are mild and sometimes atypical, and even in the presence of near-normal pulmonary ventilation function, usually undetected by physicians or patients. Timely diagnosis, effective treatment and standardized management will prevent from the progression and reduce the burden of mild asthma. In order to guide physicians in the diagnosis, treatment and management of mild asthma, the Asthma Group of the Chinese Thoracic Society organized relevant experts to develop the Expert Consensus. This consensus includes epidemiology, diagnosis and evaluation, treatment and management, education and prevention of mild asthma, also involving diagnosis and treatment of mild atypical asthma. This expert consensus is intended to provide with expert opinion to improve the understanding and standardized diagnosis and treatment of mild asthma among clinicians in China, especially in primary care clinics.