In some bulk cargo terminal projects,the location of the quay is far away from the storage area,and it is necessary to use long-distance belt conveyors to transport the materials from the quay to the storage yard. Considering the large cost of the marine approach bridge due to the conventional horizontal transportation option,we probe into the way of optimizing the layout of belt conveyors and reducing the construction cost of the whole terminal. By the double-layer design option,i.e. ordinary belt conveyor for the lower layer and the pipe belt conveyor for the upper layer,the width of the approach bridge can be reduced under the prerequisite of ensuring the effective transportation of different materials. The actual operation proves that the double-layer belt conveyor system can operate safely and reliably.