This study’s purpose is to consider a letter of self-introduction for employment activity of advanced-learner of Japanese whose mother tongue is Korean as a subject of study in the perspective of the grammatical cohesion and in the position of text linguistics. 5 elements-substitution, reference, conjunction, lexical cohesion and comma- were set as a factor influencing the grammatical cohesion and the result included cases when 2 out of 3 Japanese native speaker judged the sentence as being awkward. 21 cases of comma, 11 cases of conjunction, 9 cases of reference, 6 cases of substitution and 6 cases of lexical cohesion was verified in the result of the investigation. Especially, comma and conjunction could be said as learner’s overall feature regardless of learning conditions because they were verified in almost every learner without deviation. Also, it was identified that the reason for the awkwardness in a Korean advanced-learner’s composition is highly due to the influence of the mother tongue. So when teaching Japanese composition to an advanced-learner, letting the person recognize the importance of the grammatical cohesion in the perspective of the mother tongue is helpful in writing a natural sentence.