The apparatus can be widely used in all units of measurement, research institutes, universities laboratories, and large workshop rooms and measurement processing site of machine tools, precision instruments and precision flat rail for linear movement axis straightness measurement of the peace to the perspective of instruments and apparatus precision determination of the value of the angle. Two-dimensional measurement apparatus using the principle of the structure, can be easily on horizontal, vertical direction and a straight line at the same time point of measurement, is a compact, portable, lightweight, easy to use, stable and reliable measurements of the measurement apparatus.