Recently, there have been widespread extensive research and application on charge coupled device (CCD). The imaging shape of linear CCD is a straight line, which can efficiently scan the space plane. This paper proposes a method for target plane positioning using the accumulation characteristics of points in a space line at the same pixel position and the projection information of the origin position of the spatial plane. For the obtained linear image, we used histogram equalization, which extracts the pixel position of the measured target stably, to enhance the contrast. After obtaining the straight line solving matrix and collecting the target's pixel position of each linear array CCD, we obtained line equations passing through the target object, and finally, we calculated its plane position using the least square method. The results show that for the linear CCD module TSL1401, the average measurement error of the measurement system is about 0.19 cm and the standard deviation is about 0.09 cm in the 20 cm×20 cm measured area, proving the effectiveness of the proposed method.