The birth myth of Goguryeo dynasty appears in the preface of JianGoguryeo Bi. Although it generally overlaps what is inscribed on King Gwang`gaeto`s memorial stone, it accepts the Confucian idea of Han period such as Dong Zhongshu`s theory. This type of myth was established in the late fourth century. It was possible because Goguryeo people didn`t feel repulsion toward adoption of the culture of Han period. However, this change was not essential but rather superficial. Since Goguryeo people had different concept about heaven from Chinese, it was soon excluded from their birth myth. This is why we can`t find the trace of the Confucian idea of Han period from the birth myth inscribed on King Gwang`gaeto`s memorial stone.