Abstract: Pray of molten steel pipe grouting soil improvement, bear the function of load, also can improve the permeability of soil properties, in the foundation pit and edge (slide) in slope supporting engineering application more and more.Its main applications include sustain tension steel anchor pipe and spray of molten steel pipe pile under lateral load, and in the construction process caused by grouting pile soil properties change less attention. In this paper, based on a certain foundation pit project of Fengtai, do the sleeve valve tube grouting in the gravel soil, compared before and after the change of the soil parameters, grouting reveals the grouting reinforcement effect of soil, provide reference for later engineering application.