We know that the reading instruction is teaching the reading strategies. This statement is right. We have been teach the reading strategy to student for the improvement of reading ability. Besides we must teach the method of meaning-construction to student. Because of the ultimate aim of reading is to construct the idea about the text. So, the reading teacher should have instruct the idea constructing methods to student. This paper is intended to argue about the idea construction of reader in reading interpretive communities. The reader construct a co-idea in interpretive communities with other reader by communicating the mutual understanding of idea. The co-idea is a compound idea which is combined the stem of thoughts of the several members of interpretive communities. The reading subject forms the co-subjectivity in consequence of uniting co-idea. The co-subjectivity making is essential to the reader in reading interpretive communities The reading education for to make reading interpretive communities be should teaches the student to make the co-subjectivity. The way of making the co-subjectivity is communicating of the reading subject to gain mutual understanding of idea. In the reading instruction help the reader to have ownership about the co-idea by take part in the meaning making activity of others with communication.