Abstract: In shield tunneling, the synchronous grouting method is adopted to control the ground settlement caused by ground loss. Suzhou rail transit Line I is taken as the engineering background, 3 test sections with similar external conditions like formation characteristics and buried depth are selected, to study the influencing factors of grouting amount, grouting pressure and grouting materials on ground settlement respectively. On this basis, synchronous grouting parameters of shield and stratum settlement control measures suitable for Suzhou area are proposed. The research shows that when the grouting amount per loop is more than 3.5 m3, the effect of surface settlement control is no longer obvious; since the surface settlement is greatly influenced by the fluctuation of grouting pressure, it is recommended that the grouting pressure be controlled within 0.35~0.4 MPa range, or the higher pressure will cause the splitting and slurry running, not conductive to settlement control; the cement grout performs better on ground settlement inhabitation than the ordinary grout without cement.