The authors studied the potential field boundary identification of the new technology in order to find out the possible fractures or contact zones using the following methods such as tilt derivative，horizontal deriva- tive of tilt derivative，normalized standard deviation and normalized differential method． Combined with Euler deconvolution and small subdomain filtering，the actual data processing results show that these methods are all a- ble to identify wider range extending fractures and obtain abundant geological information． The horizontal deriva- tive of tilt derivative and normalized differential method have a better resolution for the small cutting fractures and lacunae in the studied area． They provide a reliable basis for study of the cutting relationship between fractures．