In order to provide a scientific basis for the construction of deepwater channel at Quzhou bay, we study systematically the water & sediment features, morphological evolution and channel stability based on the real investigation data of Quanzhou bay, and then forecast the siltation after the implementation of the channel engineering. Results indicate that the sea bed of Quanzhou bay has good stabilization. Water depth measurements after constructed show the deepwater channel is very stable. The research result provides reliable instruction for the deepwater channel project of Quzhou bay.