In view of water-rich section of the loess tunnel, which has the low strength surrounding rock, poor self-stablity and frequent geological disasteres, on the basis of measuring the gelation time of cement-water glass grout at different mixture ratio and influencing factors of unconfined compressive strength of soil during grouting reinforcement in the laboratory, authors research the technical parameters by the field grouting test, such as mixture ratio,grouting pressure,diffusion radiusof grout and grouting technology. The results showed that the reasonable amount of water to cement ratio is 1∶[KG-*3]1, concentration of water glass is 30~35°Be′ and volume ratio of cement-water-glass is 1∶[KG-*3]1. When the soil moisture content is 20% and density is 1.8g/cm3, with water glass concentration 35°Be′ and slurry ratio 15%, the maximum unconfined compressive strength is the largest. The simulation shows that when grouting pressure is 0.4~1.0MPa, the diffusion radius of the slurry is 0.4~0.9m, the mechanical properties of the soil have been greatly improved after reinforcement. Its ultimate load of the soil is 300kPa and the deformation modulus is 21.48MPa.