Shield is the most effective method of city subway construction. As long as the reasonable tunneling parameters are set, synchronous grouting in tunneling becomes one of the key technologies in the process of excavation. With the reasonable grouting parameters, the influence on the surface of surrounding city environment can be effectively reduced. Through the quantitative analysis on the grouting volume and grouting pressure of synchronous grouting, the control level of shield construction parameters is improved; the conclusion can be applied to the shield construction for subway and also can be the reference for other related works.