This invention is a device that measures project structure deflection settlement. It adopts a soft like cord that installs to the static object of measured project of structure not moving in a constant tensile strength, as a measurement system stationary reference point. The hang arm coming from angular displacement sensor fixed installation works in the measured deflection of the structure of themeasuring point connects to soft cords. It can measures measurement point's bend degree and settlement value through the rotation hang arm and static soft cord the angular variation.