Abstract: With the development of the Jidong oilfield,three large artificial islands have been planned in the coastal water around the Nanpu area in recent years. To well understand the character of dynamic geomorphology of the area is significant for the construction of artificial islands. Using the data of measured tide and related currents offshore, in combination with the data from side-scan sonar and offshore sampling, the authors studied the tidal dynamic geomorphology pattern around the three planned artificial islands, and discussed the possible migration of nearby sand ridges,and its impact on construction of artificial islands. The impact of the construction to the tidal dynamic system is also predicted.