a novel moving objects dimension measurement system based on the linear array ccd is designed. the light source is a pulsed laser with pulse width 200ns. single point of light passes through lens converted to parallel light which will illuminate to the ccd through the moving object to be tested. ccd pixels which are blocked by the object while light is on are low, and the remaining pixels are high conversely. the distance of the tested objects while light is on can be ignored since the light pulse width is much smaller than the integration time of ccd (generally). the size of the tested object can be achieved by the number of dark pixels of ccd while light is on. this paper introduces the principle and composition of the dimension measurement system. the results show that this system can measure the size of moving objects and measuring accuracy is better than 50 microns. accuracy and stability of the system can achieve actual production requirements when the object's moving speed is smaller than 50mm/s. optimizing the parallelism of the parallel light, the measurement accuracy can be further improved. © 2016 spie.