This manuscript attempts to comparatively decipher the acroamaticsubstances from Platonism and Confucianism, followed by amalgamation of their intrinsic reciprocity and heterogeneity, and then seeks to theorise international development issues that may be theoretically addressed on the grounds of both international relations theory and theoretical merits of Platonism and Confucianism. Both Platonism and Confucianism, which could be the indirect philosophical ramifications of a set of colloquies among myriad magnificent interlocutors within their respective historical periods, unveil substantial influences upon, and significant implications for, the Occidental Civilisation and Chinese Civilisation, ranging from epistemological interpretations of power, justice, knowledge and even governance systems. It is fair to argue that those intellectual notions from Platonism and Confucianism generate indelible merits and understandable blemishes owning to the historical circumstances, socioeconomic development, and technological advancement in a far more embryonic stage. If both can be put on an axis of international studies theory, their legacies, whose significance might outweigh their ideational blemishes, can function as the alternative theoretical guidelines to international human development issues. To evaluate the applicability and their merits on an axis of international studies, this manuscript conducts comparative studies of global poverty alleviation with the Platonic-and-Confucian-generating spirit of the UN Sustainable Development Goals, of climate catastrophe and COVID-19, and ultimately seeks to dialectically reconfigures the ideational interplay of Platonism and Confucianism with international studies, which generates formulas. Based on multiple research, it could be so far concluded and expected that irrespective of their legacies and limitations, it literally behooves analysts and connoisseurs in international studies to multidimensionally cogitate and reactivate their intellectual conceptions, especially part of constructive epistemological substances that might remain theoretically applicable to maximum inter-territorial exchanges of divergent civilisations and seeking a normative theoretical formula of addressing global development issues in a shared 21st century.
