The patent refers to the field of ' merry-go-rounds; swings; rocking-horses; chutes; switchbacks; similar devices for public amusement' . A method for constructing the artificial roaming broak features that based on the coastal terrain, such as valley, tide river, bay, island, etc. the artificial roaming broak and associated gates are built up, and the tide of seawater is used to make the seawater flow in it back and forth, so providing a roaming entertainment.