In this article, I attempt to answer the question $quot;What might be the epistemological process of the Yijing?$quot; To answer this question, I consider the possibility of the logical explanation of the Guan hexagram as follows. Thinking through the Guan gua (the 20th Viewing Hexagram) in the Yijing, I discuss the philosophical nature of the observation, contending that the epistemology of the Yijing philosophy begins from the logical characteristics of observation. However, the problem is that since the meaning of observation has been often identified with intuition by contemporary Western philosophers, the word `observation` is considered being absent of explanation, losing the justifying ability. To solve this problem, I bring the abduction logic which was invented by the American philosopher and semiotician. Charles Sanders Peirce. Abduction is different from the reasoning of deduction or induction, rather a kind of hypothetical reasoning which is able to `explain` the intuition. If we use the abductive reasoning to understand the philosophical meaning of the observation in the Guan hexagram, I am sure we can find that the reasoning is very effective. The reasoning will have an advantage when we want to give the observation an explanation. The logical process of the observation in the Yijing cannot be deduction or induction but abduction, because it is a comprehensive or intuitive hypothesis. Hence. I confirm that the intuitive hypothesis has an evident epistemological process, namely, the abductive reasoning. Furthermore, we should escape from the negative views of the intuition, that is, intuition is not reasoning.