Abstract: The slurry is made from the abandoned muddy clay as main filled material combined with the proper water and cement. Its fluidity and mechanical property after conservation is studied, in which the proper ratio of slurry in the underground abandoned pipe is also studied. Based on the indoor test, the slurry is form in the seepage tank by pump, after conservation, its mechanical property is tested in situ, the feasibility of prepared slurry in the underground abandoned pipe is analyzed, then the proper ratio is suggested.

Key words: muddy clay, filling, slurry, underground abandoned pipes