This paper treated cognition of the center meaning shift between paragraphs. The problem is related coherence. Therefore I construct two hypotheses, identify a result through the statistical procedures, and look for an education significance. The first hypothesis is a common coherence cognition between reader and writer. The second hypothesis is a nothing change in coherence cognition of writer through time gap. The former is rejected, also the latter does. The thesis is a sketch study about coherence. The correct study method, many subjects and texts leave with limits. But there is a significance that an experimentation study of coherence is the beginning in the spot korean education.