Abstract: In Xi’an, there is a large amount of saturated soft loess, exhibiting characteristics such as poor bearing capacity, strong compressibility, and unfavorable engineering properties. Therefore, it is necessary to study the deformation control and applicability of Xi’an saturated soft loess tunnel construction, considering its unique physical and mechanical properties.Method: Taking the construction of Xi′an Metro Line 4 through saturated soft loess engineering as example, the control effects of water stoppage and dewatering measures on tunnel construction structure and soil deformation are mainly compared and analyzed.Result & Conclusion: The research results show that: (1) Under the influence of saturated soft loess, vertical deformation dominates in tunnel deformation. The maximum settlement at arch crown is 6.3 mm, the maximum heave at arch bottom is 6.8 mm, and the maximum horizontal displacement is 1.8 mm. (2) When using the stepped excavation method, the maximum land subsidence occurs at ground center. When using the CRD (center cross diaphragm) construction with stepped method, the land subsidence at ground center is second to the maximum. When using shield method, the land subsidence at ground center is the least, indicating relatively less disturbance to stratum. (3) Both dewatering and water stoppage measures can effectively reduce the soil moisture content. When dewatering measures are used, the total subsidence and settlement of land and building is significant, but the difference in settlement between them is small, resulting in a stepped distribution of settlement curve. When water stoppage measures are used, the total subsidence and settlement of land and building is small, showing a trend of gradual increase. Fieldmonitored results show that: (1) After WSS (double slurry grouting) injection, the soil strength within 2 m outside the excavation contour reaches 1.2 MPa, and the soil strength within the excavation range reaches 0.6 Mpa. (2) Compared to dewatering measures, the land subsidence amount is reduced by 65% and the settlement at arch crown is reduced by 50% after WSS grouting. (3) Numerical simulation results agree with the fieldmonitored data, confirming the accuracy of the numerical simulation.