The approximate holding power of anchors is determined by the product of the holding coefficient according to seabed quality multiplied by the weight of anchors, but in this case, as for the value of the holding coefficient, the same value is used independent of the weight of anchors. In order to examine the authenticity of this fact, the authors tested the anchors of 100kg and 300kg in the sea, and knew that collating with the physical and engineering properties of seabed soil in vertical direction, the holding coefficient takes nearly the same value in the places having the same seabed quality, regardless of the size of anchors. It can be said that this result is also the same as the experimental result of large weight anchors in the sea carried out in the past, and it will be useful for the development of anchors which increase the holding power with the same weight.
