Abstract: According to the summary of the special properties belonging to Xigeda strata in Panzhihua area and the problem about its mechanical parameter values, this paper put forward the reasonable range of different mechanical parameter values of this strata, with the influence of mechanical parameter values on projects. Taking a deep foundation pit in Panzhihua as an example, we conducted the in-situ shear test and the basic mechanical test of Xigeda strata, and found out that the parameters varied greatly. The reasonable parameter values can significantly reduce the limit time and the cost. Additionally, we calculated the change of reinforcement caused by the change of shear strength parameters by LIZHENG deep foundation pit software, and conducted the sensitivity analysis on the change of safety factor caused by change of mechanical parameters. Based on that, we concluded the influence of the change of cohesion and internal friction angle on projects, then confirmed the geotechnical parameter values of Xigeda strata taken in previous projects was too conservative, and put forward the reasonable scope of parameter values of Xigeda strata, in order to save the cost and the limit time of projects, so as to provide a certain reference for similar projects.