The normal production of a mine may be seriously influenced because of low strength and poor cementation of loose surrounding rock of roadway in soft stratum.With the aim to solve the problem,by a self-developed testing device,the laboratory experiment was made on the grouting of loose media,and the grouting effects at different proportions of grout were compared.The experimental results showed that the strength and mechanical parameters of the grouted loose media were improved remarkably;the proportion of grout had big influence not only on the infiltrating radius of slurry but also on the mechanical properties of agglomeration formed by grouting.By the orthogonal design-direct analysis,it was found that the influences of various factors to grouting quantity and diffusion radius of grout were decreasing in the following order: water to cement ratio,grouting pressure and water segregation rate.And the regression models of grouting quantity and infiltration radius with the various influencing factors have been put forward.