This research focuses on the shape and arrangement of energy dissipation blocks in a hillside channel. We first developed a channel test, measured the change of channel water level and estimated the energy loss of channel flow. Then, we analyzed the best and optimum schemes for the shape and arrangement of blocks. The results show that the energy dissipation efficiency of blocks in a channel follows the order of rectangle > rhombus > square > sphere > cylinder. The best arrangement is 2:2 (the distance ratio of lateral to vertical) and the optimum arrangement is 3:2 for a rectangular block arrangement, respectively. In addition, with respect to the arrangement of blocks, vertical distance makes a larger influence on energy dissipation efficiency than lateral distance does. The results in this research are helpful in improving the efficiency of energy dissipation facilities for a hillside drainage; furthermore, it can be used as a reference in planning and designing the drainage.