Abstract：A new concept of regional NoNetRotation (NNR) reference frame for researching crustal movement is proposed. The GPS data observed in Chinese mainland and the surrounding areas is processed by use of this reference frame and a new crustal movement velocity field is obtained. The new velocity field describes very well the different kinds of crustal movements, and topographic and geomorphic phenomena in Chinese mainland. The research indicates there is a large leftlateral movement trend in the eastern China, which covers nearly a half of the area of Chinese mainland and affects the crustal movement in the entire eastern China and its adjacent areas.It is considered that the presentday coastline of China seas is just resulted from such a leftlateral movement, and Stype coastline will be more curved in the future.
