This thesis examined the Murle cross border raids and its implications for Ethiopia-South Sudan Border Security. The cross-border raids involve the cattle raiding and child abduction. This study employed a qualitative research method and social cubism theory. Five Kebelles, including Dimma town were purposely selected and data collected from them to explore the driving factors, impacts and the security implications of the cross-border raids. In each border Kebelles research participant was selected using purposive sampling method. The data gathering instruments included in-depth interview, focus group discussion, observation and secondary data review. Subjects of the study include security forces, family of victims, higher rank officials, elders and refugees. The analysis of primary data collected through key informant interview and focus group discussions entailes the ongoing driving factors and impacts of cross-border raids. The actors in cross-border raids are also described in the thesis. Cattle raiding, a longstanding practice among communities along the border was historically governed by cultural authorities and ritual prohibitions. However, after the out broke of civil war in South Sudan, raiders are now heavily armed, and military-style attacks are commonly perpetuated. Social cubism theoretical perspectives are applied to analysis the cross-border cattle raiding and child abduction dynamics and relationships. The socio-cultural values and perceptions, low living conditions, ineffective government, availablity of illicit small arms and light weapon and border porosity are driving factors that contributed for the rise in cross-border raids.The research aslo argues that the cross-border raids have resulted insecuirty for Ethiopia-South Sudan border ralations which is emerged organized crimes and prolonged frustration on the border communities. The study found out that the proliferation of small arms and light weapons have exacerbated the traditional cross border raids. It emerged the inter-ethnic conflicts, cross border organized crimes and civilian access to arms along the Ethiopia-South Sudan border communities due to the violent and frequent cross border raids.