To improve the accuracy of two-dimensional vision measurement, a new area method of verticality adjusting between optical axis and object surface of Embedded machine vision controller is proposed. The method based on 3-D imaging principle of cameras and image processing, uses Harris corner detector and spatial-moment to detect subpixel feature point, and adopts Heron Formula to calculate the special area. Then, according to the variable area rule of the relative tilted between camera lens and measured objects, the method can accurately judge the verticality between optical axis and object surface. Experiments demonstrate that the advantages of the proposed method are simple operation, stability and practicability. The measurement precision could be greatly improved by adjusting. The adjusting method has been applied in the industrial field of Embedded machine vision.