The study of Ancient Chinese logic thinking has been going on for more than a hundred years and also very fruitful. But while making more profound research and modern transformation of this thinking, there are still two questions to be addressed. The first one is how to make a comparative study? This is concerned with a methodological principle of any comparative studies: how to control the application of the comparative methods. And the second question is about the purpose of the comparative study. This question involves how to explore the ”what” and ”why” of ancient Chinese logic thinking as well as how to make traditional Chinese thoughts function in interpersonal communication nowadays.