Abstract: It is of great engineering significance to carry out mathematical statistics on the physical and mechanical properties of rock and soil layers and to study their correlation.Based on the data collected from geotechnical tests and in-situ test data of the main geotechnical layers in Urumqi city,the probability statistics and correlation analysis of the physical and mechanical properties of the main rock layers in the area are carried out by means of mathematical statistics and probability theory,and an empirical formula between the geotechnical parameters is established.The results show that the physical and mechanical parameters of silt basically conform to the normal distribution;the correlation between the liquid index and water content of silt,plastic limit and liquid limit is very strong,and it is mainly linear correlation;the number of gravity penetration of pebbles has a certain correlation with shear wave velocity,but the correlation is weak;through the analysis and study of the main geotechnical parameters and their correlation in Urumqi urban area,it can provide references for geotechnical engineering investigation,design and construction in Urumqi urban area.