In order to improve the capacity and level of quality control in oil testing laboratory,by using basic theory and method of system theory,and considering the management element and technical ability of oil testing laboratory as an integral system which decided the testing quality,a systematic quality control method of the test data was set up with the consideration of correlation of oil analysis items.All of the quality management,process controlling,data analysis and detection purpose were taken as the input of quality control,optimized quality control system was gained through the correlation analysis and element control.Meanwhile,using the correlation analysis to find the opportunity to improve the quality control system,quality control could be promoted continuously.This study can provide new thinking for systemic quality control in oil testing.