Abstract: A drawing model of slumping salvage was designed, and a preliminary analysis on drawing salvage is performed through slumping salvage tests in swampy land. Test results show that the salvage resistance is generated by the negative pore water pressure, which is larger than the resistance force on the side. Drawing speed and stewing time of the swampy soil are two main influencing factors of the negative pore water pressure. The absolute value of the negative pore water pressure increases with the increase of drawing speed and stewing time. The larger the drawing speed, the more non-uniform the distribution of negative pore water pressure. The longer the stewing time, the larger the amplitude increment of the negative pore water pressure.