The incubation period of the new pneumonia epidemic is calculated as 2 weeks at the longest, according to the latest 7th edition of the new pneumonia diagnosis and treatment guidelines. The incubation period ranges from 1 to 14 days, and patients may show relevant clinical signs in 3 to 7 days. Although there is a recent case report of a patient with an incubation period of more than 2 weeks, this is an isolated case. According to epidemiologic statistics, the longest incubation period should be 2 weeks. Because the longest incubation period is related to the clinical symptoms of the patient and the duration of isolation and observation, suspected patients usually need to be observed for 2 weeks, and if the patient develops clinical symptoms during the observation period, the patient needs to be examined at an early stage in order to rule out the presence of novel coronavirus infection. Because the new type of pneumonia within the incubation period is also contagious, patients in the incubation period or suspected patients need to be isolated for observation and examination.