Abstract: There are many factors affecting rock strength, including rock composition, fabric properties, confining pressure and temperature. This paper studies the main chemical elements and compressive rockstrength by grey correlation analysis. The correlation between rock's chemical elements and compressivestrength can provide some references for the research and engineering practice of rock mechanics properties.The results indicate that oxygen element has more effect than other elements. However, the chemical elements, from the whole integrated analysis, have no obvious effect on the compressive rock strength. More promisingresults can be obtained by analyzing the compressive strength effect of internal rock 's chemical elements(such as SiO₂, CaO).