摘要：During advanced water detection using the transient electromagnetic method, the exploration effect for water-rich area is often poor due to the interference of bolts that are distributed in different positions in working face. Thus, the study on the interference characteristics of bolts in different states has important directive significance for improving the acquisition quality and data processing method in water detection. Based on the analysis of the distribution laws of magnetic field excited by small multi-turn co.ncident loop in full space of homogeneity, the test on the interference of bolts has been designed in the mine. Through drilling 18 holes around the overlapping co.l in the working face, mass data are co.lected in order with the position change and the exposed bolt length. The results of co.prehensive data analysis show that the transient electromagnetic field is strongly interfered as the distance between the bolt and the center of the co.l is less than 3 m, and the interference varies greatly as the distance varies. On the other hand, the field induced by the bolts can be ignored as the distance exceeds 3 m. The findings can help to improve data acquisition and co.rection during advanced water detection when using the transient electromagnetic method.