The seepage field of embankment after piping was calculated by numerical simulation, and the variation law of pore water pressure at different depths and horizontal positions in the embankment was studied. The influence of piping locations and piping channel sizes on pore water pressure after piping was analyzed, and the idea of rapid identification of embankment piping based on the variation characteristics of pore water pressure was put forward. The reasonable layout area of measuring equipment of pore water pressure for embankment piping monitoring was obtained. The results show that after piping, the pore water pressure at different positions of the embankment decreases to a certain extent. The pore water pressure at the bottom of the piping channel and within a range of 1m above decreases greatly, which can be used as the buried depth range for pore pressure measuring equipment used for monitoring the occurrence of piping. After the occurrence of piping, the changes in pore water pressure at the same distance from the piping channel on the same horizontal plane are basically identical. The longer the distance between the piping channel and the embankment foot, the smaller the reduction value and reduction percentage of pore water pressure around the piping channel. With the increase of the diameter of the piping channel, the reduction value and percentage of pore water pressure around the piping channel increase significantly after piping.