This study is aimed to know the understanding models of Sebatik Island's people about nationalism. Using phenomenological approach, the result of this study indicates that there are three models of society understanding about nationalism. They are the understanding by society who have Identity Card of Indonesia (established people), understanding by society who have Identity Card both Indonesia and Malaysia or double citizenship, and nationalism understanding of society being Malaysia citizen (Malaysian loves Indonesia). The first and the second models are elaborated based on some indicators, such as ownership of identity card, currency, economics, language, education, political participation, celebration of Republic of Indonesia's independence day, and Ambalat case; and the third model is a description to complete the first and the second models explanation. Keywords : understanding, nationalism, society of Sebatik Island, Indonesia-Malaysia border.