In permeable formation, the diffusion and consolidation states of pile-bottom post grout were inspected with the sampling method. The practicality samples showed that in relatively homogeneous strata, grout diffusion were with different downward, sideward and upward penetration ability, each was the strongest, the second place and the weakest. In the alternating strata of coarse and fine particles, more coarse was the particle, the better was the permeability, the farther was the diffusion and the higher was the cement content; and in the same strata, the nearer to the grout outlet, the higher was the cement content. The sampling also indicates that the pressure and temperature at the pile bottom are different from the surface; especially in the environment with plentiful groundwater, the time delay for cement slurry condensation curing was very obvious.