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System of measuring orthogonality of stage and home positioning method using the same

Disclosed are a system of measuring the axis squareness of a stage and a home positioning method using the same. The system includes: first and second X-axis driving feedback devices each installed to a pair of guides positioned on both sides of the stage to measure a displacement for the stage in the X-axis directional movement; a Y-axis driving feedback device installed on a stage crossbeam to measure a displacement for the stage in the Y-axis directional movement; first and second X-axis absolute value feedback devices installed on one point wherein the crossbeam and the guides are intersected on both ends of the crossbeam to measure a position of each axis configuring the squareness of the stage; and a control unit to receive feedback from the first and second X-axis driving feedback device, the Y-axis driving feedback device and the first and second X-axis absolute value feedback device to control the position movement of the stage, and detect a variation in the squareness of the stage.