Fujian Yanshanian granite is widely distributed in Xiamen, Fujian Province. A certain thickness of granite weathering crust is formed due to long-term weathering. Near-surface residual soil which has certain strength. It is of great importance for engineering construction to explore physical and mechanical properties of residual soil. According to the principles of statistical analysis, the authors use geotechnical test data of Shenyang-Haikou Expressway (Xiamen) to statistically analyze physical and mechanical parameters of granite residual soil, evaluate the credibility of the data. Finally, statistical value, range and confidence interval are given on the basis of experimental data.