Abstract Based on geological-geophysical data of the East China Sea, this paper deals with the dominant role of Zhoushan-Guotou fault zone lying astride the East China Sea area in the Geological structural framework of the Plast China Sea and the extension of this fault zone."Being divided into zones in EWdirection and into blocks in SNdirection" makes up the basic property of the geological structures in the East ChinaSea and also the fundamental character of geophysical field in this area. Nevertheless, the disputes remain unsettled as to where the boundary between the south block and the north block lies and whether the Zhoushan-Guotou fault zone extends towards the continental area. These problems are related to geotectonic framework of eastern China. According to geophysical and some geological data, the author puts forward his own views on these problems for further investigation and discussion.
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