Abstract: Abstract: Traditional mine transient electromagnetic advanced detection technology has volume effect. The technology can only detect the position of watery goaf, but it is difficult to accurately detect watery boundary of the goaf. In order to accurately detect the distribution and watery boundary of goaf in front of 9101 roadway, advanced detetion data was processed by wave field imaging system based on mine transient electromagnetic method. The results showed that watery boundary position of the watery goaf can be delimited by wave field imaging system, The amplitude of the wave field curve corresponds well to the position of the watery goaf. The boundary position of the watery goaf is more consistent with the wave field imaging results.