Lebanon is a Middle Eastern country that has a geopolitical location despite its low area. The Lebanese community consists of ethnic, racial, linguistic and religious minorities and this kind of ethnic and religious expansion has been the cause of the rift, split, tension and struggles in the history of the country. In fact, every member of the Lebanese community is more than a national figure, with an emphasis on the Infranational elements, especially ethnicity and religion; defines himself as Sunni, Shi'a, or a Maronite Christian. Undoubtedly, in such a society, on the one hand, the crisis of identity affects all levels of society and, on the other hand, people are alien to their political system; one cannot expect the country to suffer from a crisis and political instability. This research examines the question of "How did the ethnic cleavage affect Lebanon's political instability? The descriptive-analytical method analyzes the hypothesis that the existence of sectarianism and the overriding sectarian and ethnic identity of the nation have played a decisive role in the continuation of the political crisis in Lebanon. The findings confirm the validity of the above claim, suggesting that the ethnic-religious gaps were the most important factor in the formation and continuation of the political crisis in Lebanon, which led to weakening the government and the inaction of political institutions, civil wars. In which the spirit of collective and ethnic identities governs not the spirit of national identity.