Abstract: During the mining process of metal minerals，the overlying strata are destroyed，and the water-rich area of the roof is communicated，which seriously endangers the safe production. In order to prevent water disaster，the mine transient electromagnetic method is used to penetrate the roof area，so as to delineate the water-rich area. The data are collected by transient electromagnetic method. After data inversion，the distribution range of high resistance anomaly and low resistance anomaly of roof is visually displayed. By analyzing the distribution of high resistance anomaly and low resistance anomaly，11 water-rich areas were identified and delineated，including 5 strong water-rich areas，2 medium water-rich areas and 4 weak water-rich areas. The results show that the mine transient electromagnetic method is applied to the roof water-rich area detection and water-rich research with good effect and high accuracy，which can provide reliable data for water disaster warning.

Key words: transient electromagnetic method, low resistivity anomaly, water-rich roof