Grammar education is always concentrated on knowledges. From 1992, when heuristic method was firstly offered, Korean Educationalists now have had a different viewpoint of grammatical knowledge. This status has brought out the changes of grammar assessment tool. In this respect, I assumed that the each components of assessment tool is closely connected to the viewpoint of grammar knowledge. In this thesis, I've made up a assumption that ‘text-centered principle’ is now considered as the alternative in grammar assessment. Then, I've analysed the status and role of the text in grammar assessment item of National Achievement Assessment(2005~2008). Finally, I've indicated that ‘text-centered principle’ is actually vague and doesn't have any meanings as a alternative assessment tool.