The 1975 Lebanese Civil War had impacted the Middle East and the international community seriously．This war was driven by its deep domestic roots． At the political level，political sectarianism laid the foundation for Lebanon to achieve national independence，but it became an obstacle to its future political development and reform． Increasing contradictions between Muslim community's demand for a larger share of political power resources and Christian community fears of losing privilege have become the main reasons for national identity crisis． At the economic level，Lebanon's economy developed rapidly， but faced dual pressure brought about by both the intensification of sectarianism and class conflicts． The Lebanese government's social governance and crisis management capability continued to weaken during the post-Chebab era．The interweaving of the above factors constitutes domestic roots of the outbreak of the 1975 Lebanese Civil War．