Abstract: In this paper, through working on C/O ratio to get rid of zero drift, and limit the C/O radio to the generalized performance range, and use universal interpretation model to deal with data of C/O ratio. Through combinating the experiment data, the relationship between the zero drift and the output in C/O ratio spectrum log is obtained. And the standard of high precision C/O ratio energy spectrum interpretation is received. Based on careful research and dynamic analysis, using many kinds of logging data and evaluating the reservoir,then better geological effect is obtained.This method is applied in many wells in Daqing and Liaohe oil field.The result indicated its precision ratiois more than eighty percent.