2021 celebrates the 300 years of Liugdui Hakka. Liugdui represents a very important period in the history of Taiwan's development. These 300 years of Liugdui have not only witnessed the development of this land, but also observed the interaction and integration of ethnic groups on this island. In this journey full of hardships and difficulties, the history, folklore, humanities and industry that had come along present profound research value. We have the honor hosting the 2021 International Hakka Conference, “Three Hundred Years in Liugdui: from the History to the Co-Prosperity of Diverse Ethnic Groups”. We very much appreciate the support of the Hakka Committee and the participation of global experts and scholars. Everyone is cordially invited to join us setting a milestone together for the next 300 years in Liugdui.