Recently, a notable pattern of synchrony of influenza A and B virus, and respiratory syncytial virus incidence peaks globally was reported in this journal. A previous study characterized seasonal pattern of influenza A and B in China and identified three epidemiological regions featured by distinct seasonality. On the basis of laboratory surveillance data from 30 Chinese provinces spanning about 12 years from October 2004 through January 2017, our study further characterized seasonal patterns of circulating influenza A subtypes and influenza B lineages in the three defined epidemiological regions.