Abstract: That water-sensitive stratum's fresh surface exposed by engineering machine are softened and argillizated by water will cause the deformation of rock increasing and lead the hole (pit) wall to be unsteady. Experiments indicate that non-solid phase stabilizing fluid of macromolecule polymeric of low polymerization degree, non-ion and good crystallization is able to produce dialytic and absorbent cementation on the inner and outer surfaces of the rock with rapider competitive absorption rate and form a film under a irreversible agent. Therefore, PAA non-ionic polymers can be used to solve hole (pit) wall collapsing problems caused by a great quantity of free water filtered from mud and the mud skin easy to fall off since they restrain water's softening, argillizating and calving.