In order to improve the measurement precision for intersection measuring system with double-charge coupled device (CCD),a mathematical model for measuring system is established according to geometrical imaging principle. Through analyzing the measure accuracy of the measuring point in the system,the effect of the visual sensor structural parameters such as the angles formed by optical axes of two cameras across a baseline,baseline length on the measurement result is investigated. The simulation results indicate that with a symmetrically-set and longer focal length doube-CCD measuring system,when the angles formed by the optical axes across a baseline are between 30° and 70° and the measuring point is located in the center of the system,the higher coordinate measuring accuracy can be obtained. The results is evaluated in designing double-CCD visual sensors.