Abstract: Objective:To study the clinical and imaging features of influenza B in women in pregnancy so as to provide basis for the diagnosis,treatment,assessment and prognosis of the disease.Methods:The clinical features,treatment and imaging changes of 6 pregnant women with influenza B were analyzed retrospectively.Results:All the 6 cases presented the symptoms of fever and cough,but lung signs were unobvious.Three cases showed pneumonia signs and 3 bronchial infection signs on the chest imaging.Five cases receiving cesarean section had five healthy newborns.No respiratory failure occurred,and all the 6 cases were cured.The average hospital stay of the 5 cases with cesarean section was 6.6 days.Conclusions:The symptoms of influenza B in pregnant women are often severe,but presenting light physical signs.The imaging manifests small area virus pneumonia or bronchial infection signs;the prognosis is fairly good.Women in late pregnancy with influenza B should be ready to receive cesarean section at any time if necessary.