Abstract: The trajectory of German Idealist aesthetics form Kant to Hegel revolves around the developmental process from philosophical analysis of psycho-aesthetic structure to dialectic examination of aesthetic object down to critical aesthetics and philosophy of art, with a knowledge background of modern European intellectual climate or the pursuit of determinacy. Schiller's On Beauty (Kallias, 1793), by exhausting the research methods of beauty, constituted an intermediary link in the advancement in German Idealist aesthetics and established its inerasable significance in the history of aesthetics.

Key words: German Idealist aesthetics, logical progress, Schiller, On Beauty (Kallias), pursuit of determinacy