Abstract: According to a large amount of data,the authors have demonstrated the extending to the east of the Yangtze fault zone and indicated that its continuation passes through Jiangyin,Shazhou,Jingjiang and Nanton of Jiangsu province and sea waters of southern Yellow Sea. Nature of the Yangtze fault zone is also discussed. The authors consider that the Yangtze fault zone has been a great modern continental rift zone since the Late Mesozoic,1500 km long and 40—80km wide (the rift valley basin is 10—25km wide). The zone here called Yangtze rift valley zone is typical of features of rift valley; for example,the depth of the rift zone is an elevated one of the mantle current zone,and the like. This,therefore,may serve as a mirror of the modern continental rift zone in the world.