The paper strongly emphasize on the implication of Cassation over Cassation in Ethiopian federalrncontext: with special reference to the principle of Self-Determination. Principally, the FDRE Constitutionrnhas established ethnic based self-governing federal arrangement in one hand and incDlporatesrnseparation of powers especially, dual Court (dual Cassation) system in Ethiopian federalism on the other.rnBesides this ethnic federalism and the principle of self-determination has been established as arncornerstone of the federal system. The main issue to be addressed in this paper is as whether the FederalrnSupreme Court Cassation division has been exercising its function properly within a scope allocatedrnbetween the f ederal government and regional governments, or in the way contradicting with the principlernof self-determination. The thesis has also tried to explore the government bodies to take necessOlYrnmeasures based on theDlY of separation of power in giving the required remedy in the practice ofrnCassation over Cassation. In doing so the writer has analyzed real cases that are State mailers in naturernbut finally decided by federal Supreme Court cassation division. The writer has also provided interviewrnresponses and sample respondents Fom targeted groups who generously cooperated in giving a properrnanswers to the questionnaires and jilrther scrutinizing the meaning of Ethiopian federal constitution asrnexperiences of other countries correlated with the objectives of this thesis. After making serious analysis,rnthe writer, eventually, has reached the Fo/lowinR findings: the federal arrangement of Cassation overrnCassation in Ethiopian Federalism has emanated Fom the practical motion in which case distorts therndual court structure andjimctioning out of the Constitutional terms and it shows negative implication onrnEthiopianfederal context and particularly on the prinCiple of self-determination. Thus, the power of StaternSupreme Court Cassation division has been disregarded and prevalence of Cassation over Cassationrn~rnsystem has eroded the principle of self-determination that evenlually leads to centralization of power inrnthe counlly. Based on the findings and the conclusions the writer come up with the political theDlY ofrn~rnfederalism must thus be resolved by the Federal Supreme Court Cassation division should be stoppedrnFom intel/ering in state mall"!!. The State COllrts should not be subjugated by the center on their ownrnmalleI'S. Intelpretation or modification of unclear provisions by the concerned governmental bodies asrnpredisposed is an appropriate option in order to aileviate the converging func tion and the wrongrnconsll'uction of regional laws version through practicing Cassation over Cassation in the modernrnEthiopianfederal context.rnKey words: Cassation, Cassation over Cassation, Federal Supreme Court Cassation Divi sion, StaternSupreme COLI rt Cassation Di vision, Federa lism, Constitution, Self-Determination and COLIrt.