E-W-trending basement structure, which is the key rock- and ore-controlling factor in the Xiangshan volcanic basin, has long not been recognized because of lack of thedeep exploration means. Previously the N-E-trending structure going through thecover deep exploration means. Preciously the buried E-W-trending structure going through the coverwas presumed as the principal structural line. In recent years, huge buried E-W-trending structure has been discovered in the basement of the Xiangshan volcanic basin by integrating the large-scale gravity survey, enhancement process of remote sensing TM data and study of modern deep-seated hot water. The author first puts forward a new view that the E-W-trending structure belt controls the ore accumulating zones of the Xiangshan uranium orefieldand points to a new ore-finding direction, which has important significance for the futureexploration of large and high-grade uranium deposits in the Xiangshan area.