This research is to explain how the failure of African Union to solve Darfur Conflict in Sudan in 2004 until 2007. Darfur conflict was began in 1983, when Arabic ethnic supported by Sudan government are in conflict with the African ethnic who are the identity of Darfur rebelian.African ethnic felt ignored by the government choose to joint with a movement that namely the Darfur Liberation Front (DLF) which changed the name to Sudan Liberation Movement/ Army (SLM/A) and joint with Justice and Equality Movement (JEM) in 2002. The war began intensively in early 2003 when SLM/A attacked the Sudanese military group called “Janjaweed”. African Union as an African region Organization sent their army called African Union Mission in Darfur (AMIS) to carry out peacemaking mission to solve Darfur conflict. But African Union effort have failed to arbitrate the parties who involved in the conflict because widespread conflict and several failure factor to solve the conflict.