Summer is the season of high incidence of acute Upper respiratory tract infection, especially children are more likely to suffer from this disease in this season, which is the most common acute infectious diseases in childhood. If the disease spreads downward, it can cause Tracheitis, bronchitis or pneumonia. Sometimes, it can also cause nephritis on the body. Recently, an article entitled Expert Consensus on the Application of Nasal Saline Flushing in Children with Upper respiratory tract infection (2023 Edition) (hereinafter referred to as "Expert Consensus") was published in the Chinese Journal of Clinical Applied Pediatrics. How can pediatricians and parents improve and help alleviate clinical symptoms of upper respiratory tract infections in children during summer through physical therapy? Recently, the corresponding author of "Expert Consensus" - Yin Yong, Director of the Respiratory Department at Shanghai Pediatric Medical Center, gave a relevant interpretation. The main route of children's Upper respiratory tract infection (Upper respiratory tract infection, URTIs) is the general term for acute inflammation of the nasal cavity and throat in a broad sense, including nasopharyngitis, laryngitis, Tonsillitis and other diseases; In a narrow sense, Upper respiratory tract infection is also called Common cold. After breaking free from the constraints of masks, changes in lifestyle habits and environmental temperature differences have increased the incidence of upper respiratory diseases such as syncytial viruses, coronaviruses, and influenza viruses. Yin Yong stated that recent patients are mainly children and susceptible populations with low immunity. Clinical medical research has found that droplet transmission is still a recognized mode of transmission for respiratory virus infections. Yin Yong introduced that the nose is the first line of defense organ that never closes and bears the primary responsibility of being a "breathing guard". The total amount of air we breathe every day is as high as 15000 liters, with over 10000 types of bacteria entering the nasal vestibule. As an important part of upper Respiratory epithelium immunity, the nasal cavity also undertakes the "important mission" of resisting viruses. Experts on the application of nasal saline irrigation agree that the summer vacation travel to be popularized at this stage has increased the opportunities for children to have Close encounter, and has also created conditions for the spread of respiratory viruses. The common clinical symptoms such as runny nose, stuffy nose, sore throat and cough also occur more frequently. The differences in climate and environment lead to different complications in different regions. Yin Yong believed that the Tracheitis or pneumonia caused by common respiratory tract infections in the north might be more serious than that in the south. The current research shows that there is no specific drug for the virus, which is mainly Symptomatic treatment. Doctors will take corresponding drugs to alleviate any symptoms. The nasal irrigation introduced in the "Expert Consensus" combines the characteristics of therapeutic effectiveness, convenience, and high cost-effectiveness. This physical therapy method is suitable for children of all ages. Yin Yong said: "Nasal flushing can directly flush and discharge the virus, inflammatory secretion, etc. in the nasal cavity, reduce the Viral load in the nasal cavity, and reduce nasal congestion, runny nose, cough and other related symptoms." However, the application of nasal flushing in children with Upper respiratory tract infection is still lack of unified norms, and there are clinical use errors. It is reported that the "Expert Consensus" is composed of the Respiratory Group of the Pediatric Branch of the Shanghai Medical Association, the Respiratory Group of the Pediatric Branch of the Jiangsu Medical Association, and the Pediatric Branch of the Fujian Medical Association