Accropode is a kind of armor block, which is composed of three bars. The bars at both ends are parallel, and the bars in the middle are orthogonal to the bars at both ends. The shape of Accropode is like the Chinese character "Wang" with a 90 degree twist in the middle. It is also called "Accropode" or "hook block". The material is concrete, which is poured by setting formwork at one time, which is generally pure concrete pouring. However, when the weight of Accropode is greater than 40t, reinforcement or other anti fracture strengthening measures should be provided, such as increasing the diameter of waist pole, etc., to strengthen the anti fracture capacity of the block. It is usually placed on the outermost layer of the breakwater to protect the breakwater by weakening the impact of waves.