This essay is to study European Union(EU) and Member nations’ action how to cope with Kosovo crisis through the mechanism of Common Foreign and Security Policy(CFSP). Kosovo, one of Serbia Republic’ provision in Federal Republic of Yugoslavia(FRY), which 90% civilians are Kosovo Albania, want to pursue full independence from FRY. Milosevic, president of FRY, and FRY authorities ordered the military and security forces to suppress Kosovo Albania rebels(Kosovo Liberation Army, KLA) and civilians which caused military clash and human catastrophe. This essay studies the problems what EU and member nations faced during the crisis, taken decisions and how to implement the common foreign policy that began from EU member nations and Contact Group with other International Organizations included Organization for Security Co-operation in Europe(OSCE)、North Atlantic Treaty Organization(NATO), interfered and asked both sides to settle down by negotiation February 1998, through the Holbrooke-Milosevic agreement and Rambouillot peace conferences, to 78 days of NATO air bombing FRY military and security forces facilities June 1999.