We conducted structural analysis to investigate disadvantage of wire-mesh arranged at the plane and to develop three-dimensionally bent U-type wire-mesh. In all case that distributed loading at the whole top slab and the half top slab, and the wire mesh was bent $45^{circ}$, flexura tensile stress was the fewest in both positive moment and negative moment, and the wire mesh was bent $45^{circ}$ in crossway the shear stresss was the fewest. Therefore, by arranging wire-mesh with $45^{circ}$ more bent than plane, flexura tensile stress, shear stress, displacement will be reduced and structural function will be improved.