Abstract: With development of the highly integrated and high power radar with large aperture, the effect of radar structure precision is more and more obvious on the low side-lobe level, angle measurement precision, et al. In order to improve the rationality of structure precision parameter assignment, it is necessary to analyze the corresponding relationship between the structure precision parameter and the electrical parameter. The effects of error effect factors on structure precision are analyzed one by one, aiming at the array surface precision, axial precision of the antenna pedestal, the array position precision and calibration precision which are highly related to the electrical parameter. A concrete assignment project about typical radars is provided and a numerical calculation method of the antenna structure effect on angle measurement precision is obtained. Examples about the structure precision measurement and calibration are given based on analysis results. It can be used as reference for precision design and measurement of similar radars.