This dissertation plans to contribute to a study of the philosophy of time and the ethics of Deleuze, by scrutinizing the conception of time drawn from the three syntheses in Difference and repetition and that of ethics which is embodied in the article titled "Spinoza and the three 《Ethics》 " (Critical and Clinical), in order to show the isomorphism between the ternary structure of the three syntheses of time and that of the three Ethics. This brings about a meta-ethical stake going beyond the deleuzian scope and also enables to recapture the conception of ethics from a perspective of time. It’s about trying to arrive at a meta-ethical reflection, on the deleuzian ethics inspired by Spinoza and Nietzsche, from this ’problematique’ of both time and ethics. The approach and the style that are adopted to realize this theme are neither exegetical nor hermeneutical, but inclined to construct the arguments. Hence, instead of adhering to the deleuzian assertions taken for granted, by insisting on an intellectual reserve and by practicing an argumentative attitude, a genuine conceptual dialogue with Deleuze from an external point of view becomes possible. This argumentative dialogue is realized by applying some powerful concepts, which don’t necessarily attach to the deleuzian system:the concept of’presentism’is introduced by joining it with that of the spinozian’expression’in order to make all the three syntheses of time univocal; the concept of’abduction’is invited to clarify the particular philosophical manner of Deleuze. Therefore, this dissertation privileges an externalist point of view in the reading of the articulation between ontology of time and ethics.