The article reviews the myths of the Cham people about the ancient kingdom of Champa, existed 17 centuries in Central Vietnam and totally controlled the East Sea. The decipherment of those myths will help us have a better insight to the process of expanding the territory to the South. of Vietnam. The expanded territory included two kingdoms with highly-developped cultures and civilizations. the authors Vietnamese came and received. Although those two civilizations almost vanish, only the relics left, they are priceless values, and the authors should take charge of conserving and developing the natural environment and cultural space of those lands.