Abstract: Aiming at the problem of complex Light of double CCD intersection vertical target when used indoor. a measurment principle of single linear array CCD camera vertical target was presented. Two low-power semiconductor laser with projection board were used as the lamp-house of the CCD camera. The detection light screen of the CCD camera and the laser lamp-house were adjusted to same plane. When projectile passed through the detection light screen, it block the part light of the two lasers and left two shadow on the board. The two shadow were acquired by the CCD camera and their-coordinates were cilcutated by computer, then the projectile coordinate of X and Y were obtained through further calculation. The measuring principle and the formulas were given, and the measuring error was analyzed. The results show that the coordinate error of X and Y are all less than 1.4 mm when the detection light screens is 1m1m, and this solution has advanLanges of simple,low-cost and easy to be engineering implemented.