This study attempts exploring psychological dimensions in diplomatic practice in order to achieve a more profound explanatory adequacy of diplomatic practice. This is done by researching the relationships between the macro-political level and the micro-psychological level. Accordingly, It assumes that diplomatic practice is a process understood within a complex combination of macro external constraints such as politics, economics, law, security, etc. and micro internal constraints, such as decision-making, self-presentation, self-respect, and cultural biases, etc. The study uses the descriptive analytical method. Its methodology is based on the combination of political theory and psychological theory, placing political theory at the macro level and psychological theory at the micro level. The study concludes that the introduction of psychological laws in the interpretation of diplomatic practice would reduce the "great abstraction" in the political theory. It recommends the need to establish more detailed research concepts that understand the complex relationships between diplomatic practice and human nature.