Conflict is common phenomenon among all humans around the world. It is the human nature. In dealing with these conflicts, this book is very important since indegenous institutions are a crucial point of reference in Conflict resolution and peace building arenas. The Role Women play in indegenous mechanisms of conflict resolution is the main face of this book through Siinqee or the weapons of Oromo Women to fight violations of Seera waqa and Safuu or the ethical moral cosmic order. Women with Siinqee is more powerful than elders in Conflict resolution and reconciliation. This show that Siinqee is a symbol of authority of Women or spiritual power they among the Oromo and particularly among the Arsi Oromo under 21st century conditions.