This essay is a study of the history of conflicts of the Albanians and Serbs in Kosovo. The city Kosovo was once the political and cultural center of Serbs, but they had been expelled because of the invasion of Turks. And when the Turks come, there were also a lot of Albanians come into this city with them, and got the dominance of this city. Under the cruel governing of Turkish sovereign, the conflicts between these two nations had been repressed. But in the nineteenth century, aroused by the nationalist passion, the antagonism between Serbs and Albanians became more severe. After World War II, the reputation and management of Joseph Tito incorporated all the nations in Yugoslavia concordantly. But when Tito was dead, and also the decomposition of Soviet Union, the internal condition of Yugoslavia was out of controlled and the civil war was occurred. The ethnic conflict in Kosovo is the continuation of the civil war, but also the arena of the international great powers. And this kind of ethnic conflicts could also occurred in anywhere in the world.