Mythology is composed by primitive people, reflecting the state of living matter and the human spirit in the dawn of history. The myth of giant gods are considered the first class mythology appearing early in the history of ethnic literature. Image of the giant gods who have the statue and extraordinary health is a familiar motif in the system of ethnic myths. Through this article, the author would like to cover some of the common features, also known as the "common denominator" of giant gods folklore treasure of Vietnam. With cross - sectoral approach, on the basis of many researches on ethnic myths, with their insights, the author initially decoded symbol system in the mythical treasure of the ethnic groups in Vietnam.