Core competence can be evaluated from multiple dimensions. From the characters of core competence, this study extracts two major factors which are profitability and inimitability, and establish a twodimension space. Every enterprise has the unique corresponding position in the space. Based on scientific evaluation index system, through calculating the grey relationship between each enterprise and 'the ideal enterprise', we can evaluate core competence of each enterprise, and fix position in the twodimension space. Through observing the distribution of every enterprise in the space, we can compare the relative strength of core competence of each enterprise.