This articles is to present a relevance of Aristotle's predication theory and Syllogismos
in Aristotle through analyzing the definition of Syllogismos in the given Aristotle's
texts(An. Pr. A, 24b18-20; Ret., 1356b16-17; Top., 100a25-27; S.E., 165a 1-2). A main
topic of Aristotle's Logic is inference(sullogizesthai). Aristotle's predication theory
classifying on what there is('ta onta') is formed by the basic structure of his thought, and
reflected his world views of Being. In a word, his predication theory is basically designed
to reflect his ontology. In the present paper I argue Aristotle's theory of syllogismos
underlying in his predication theory depended on his ontological thought. To show this
relevance, firstly I consider the scientific function of syllogismos by analyzing its
definition. Secondly I examined the modern interpretations and aspects of Aristotle's
Syllogismos presented in modern scholars. The modern interpretations of the theory of
Syllogismos are commonly followed in the line of mathematical model. Modern
interpretations depended on mathematical model divided into a axiomatic system and
natural deduction system. I agree also that Aristotle believed that all deductive inference is
carried out by means of syllogismos. Even though these interpretations of mathematical
model are generally helped to understand the theory of Aristotle' syllogismos, but invoked
the possibility of the serious mistakes in any important points in the original purpose of
Aristotle's scientific function and intention involved in the definition of Syllogismos. In
order to escape this misunderstanding, as a final remark I would like to emphasize the
tentative nature of my results and the possibility of the ontological interpretation of the
theory of syllogismos. I have left several issues unanswered and there many interesting
questions which have not been discussed at all.