First step in interpratetion of seismology data is a quality control of these data, one of the problems in recording seismic in some area for producting hydrocabone, is generative platforms and for preventing of creating gap under that platform during survey,a tecnic is used that called Undershooting, Undershooting effects close to the Wells and other obstacles, Appear because of disability of the boat in recording seismic lines and then decrease in number of recordings points and losing near offsets. If we don’t pay attention to these effects, may be confused with the fault. These effects can be distinguished by applying Ant tracking Attribute on the seismic section.