Abstract: An image data measurement system was created based on the moving target performance testing requirements and the characteristics of test platform, in order to realize video recording and external parameters measurement of the target. Multiple highspeed cameras were reasonably arranged from calculated distance of the camera and mimic diagram. Camera calibration method was used which is combined the checkerboardlattice parameter calibration in OpenCV with the linebasis field calibration. Additional, highspeed image data, midline video data and GPS data were combined to achieve the measurement of position, attitude and other external parameters. Analysis of measurement accuracy and experimental results prove that the measurement method is accurate and reliable. Its coordinate accuracy is better than 10 cm in horizontal direction and 5 cm in elevation direction, and the attitude accuracy is better than 05, which fully meet the measurement accuracy requirements..