Abstract: Peck method plays an important role in predicting the ground surface deformation caused by tunnel construction, but the method only considers some factors based on experiences while studying the ground surface movement parameters. In view of this limitation, on the basis of collecting and sorting out the data of Urumqi metro Line 1, the surface movement parameters of Peck method (settlement trough width coefficient i and stratum loss rate η) are studied by means of numerical simulation and gray relational theory. 8 influencing factors about soil parameters, tunnel design index and monitoring index are selected to calculate the correlation between the factor influence, coefficient i and loss rate η. The result shows Poisson′s ratio has a much higher influence on i than other factors, while the value of η has little correlation with the angle of internal friction, showing no significant difference in correlation with the other 7 factors. Therefore, it is reasonable to consider all factors through experience method.