The primary purpose of this paper is the deliberation of sediment treatment strategies which were important to reduce the amount of sediment yield caused by soil erosion and landslide in the upstream of reservoir watershed during typhoon events. Excluding water and soil conservation, the proceeded treatment of Northern Region Water Resources Office to reduce the deposited sediment was dredging. However, most sabo-dams are located in the upstream, where the transportation is inconvenient and the cost is too much. On the other hand, the bulk volume of annual dredging is 0.4 million m3, which is almost the limitation of the capacity in removing the dredging by trucks. Several possible plans were discussed in this paper, and some suggestions were also proposed as the reference for executive administrations in the treatment of deposited sediment.