The reality of the Middle School Japanese language Textbooks "Chuto-Kokubun" has not been made clear.In this paper, I will make out three points.as follows: (1) Chuto-Kokubun was compiled and published:vol. 1・2 ware for the first grade. vol. 3・4 ware for the second grade.vol.5 was for the third grade. and vol.5 was for the forth grade. (2) Vol. 5 and 6 of Chuto-Kokubun ware compiled, but not used. (3) Several materials of Vol. 5 and 6 of Chuto-Kokubun ware duplicated.