A system for controlling an impact load resulting from a fluid under an internal/external force in a specific environment, the system comprising: a floating means arranged horizontally inside a predetermined amount of fluid existing in an open space or in a space having a sealed interior; a position adjustment means vertically connected to the floating means and arranged in a preset position inside the fluid; a sensing means selectively installed inside the fluid, on the floating means, on the position adjustment means, or on a structure positioned in the periphery to sense a physical change of at least one preset measurement object; and a control means for predicting/monitoring and predicting/controlling fluid dynamics-related environment internal/external forces, hull stress, six-degree-of-freedom movements, and positions in connection with a transportation means or a maritime structure, on which the floating means, the position adjustment means, and the sensing means are installed, using the physical change value related to the measurement object transmitted from the sensing means, characterized in that the position adjustment means comprises at least one of a first floating body arranged at an upper part of the floating means and at least one of a second floating body arranged at a lower part of the floating means, and wherein the system further comprises a connecting member connecting the first floating body and the second floating body to the floating means, and wherein the first floating body has a specific gravity smaller than the fluid and the floating means, the second floating body has a specific gravity greater than the fluid and the floating means, and the floating means has a specific gravity greater than the fluid and the first floating body and smaller than the second floating body. a floating means arranged horizontally inside a predetermined amount of fluid existing in an open space or in a space having a sealed interior; a position adjustment means vertically connected to the floating means and arranged in a preset position inside the fluid; a sensing means selectively installed inside the fluid, on the floating means, on the position adjustment means, or on a structure positioned in the periphery to sense a physical change of at least one preset measurement object; and a control means for predicting/monitoring and predicting/controlling fluid dynamics-related environment internal/external forces, hull stress, six-degree-of-freedom movements, and positions in connection with a transportation means or a maritime structure, on which the floating means, the position adjustment means, and the sensing means are installed, using the physical change value related to the measurement object transmitted from the sensing means, characterized in that the position adjustment means comprises at least one of a first floating body arranged at an upper part of the floating means and at least one of a second floating body arranged at a lower part of the floating means, and wherein the system further comprises a connecting member connecting the first floating body and the second floating body to the floating means, and wherein the first floating body has a specific gravity smaller than the fluid and the floating means, the second floating body has a specific gravity greater than the fluid and the floating means, and the floating means has a specific gravity greater than the fluid and the first floating body and smaller than the second floating body.