This study aims to investigate the difference of synoptic characteristics over East Asia according to the persistence of rainfall in Korea during the Changma season (June and July). In the cases of consecutive rainfall which lasts four or more days, there are developed ridges in 850hPa level east of the Korean peninsula which introduce stagnation of the synoptic cyclone over Korea. An cold area in 850hPa level moves southward from the Northern China in one day before the beginning the rainfall day in Korea and it aids the development of the stationary front in East Asia. When rainfall lasts a day or two, cyclones pass over Korea in rainy day and the stationary front in East Asia is not intensified. In both cases the synoptic cyclones near the Korean peninsula shows a deep-baroclinic structure, while in the former cases over the southwestern part of Japan a subtropical frontal zone which has a shallow structure appears near Japan. In latter cases the frontal structures are same near Korea and Japan. So, this means that the Changma is not necessarily similar to the Baiu of Japan in all cases.