The cutter-suction dredger is realized by positioning pile and winch and can move and operate in water. So how does it dredge by moving sideways? Cutter suction dredger generally has two winches, placed on the left and right sides of the bow. Its positioning system is generally two positioning piles, respectively installed on both sides of the stern. The reamer is mounted on the front part of the dredger. In dredging operation, the reamer depth is controlled by the gantry bracket. When moving sideways to the right, the left positioning pile is closed, the right winch begins to agitate the cable, at the same time, the left winch begins to loosen the cable synchronously, and the reamer moves horizontally to the right under the action of the right winch. When the cross moves to the maximum, the gantry tightens the cable to lift the reamer, then tightens the left winch cable, the right winch begins to loosen the cable synchronously, and the reamer is turned back empty. The above is the principle of horizontal dredger dredger. In the transverse operation, we must first understand the reamer rotation direction and then carry out the transverse dredging operation. When the reamer turns to the right as the direction of work, then the reamer to the right horizontal movement is the work, left is empty turn back. If the working direction of the reamer is to the left, then the left horizontal movement is the work, to the right is empty turn back.