Taking the Suez Canal container terminal phase II marine works for example,and aiming at the technical measures adopted by the 56 m3 grab dredger in the construction of the basin and revetment,we put forward the new improved method of large capacity hydraulic grabs in the revetment. The results indicate that the new method has an advantage over the traditional ones in the control and operation of dredging. So it is awarded for its excellent jobs and effective control of the over-depth and over-width of the slop. It also benefits for the contracture of the armor layer and mixing filter layer,and thus reduces the construction cost.