Whether it’s because of the case condition, adjustive measures to local conditions, or even further refinement rules or legislation followed suit, in pursuit of certainty for application of the exclusionary rules of oral confession from uncertainty of the legislation the precedent , the principles of the I ching can provide us the effective tool with a grasp of the change trend of the illegal confession exclusionary rules’ text and the model of judicial practice.It is because the eternal pursuit of justice, that exclusionary rules of oral confession have started from scratch, and developed from few to many in text and practice. Exclusionary rule of oral confession in different periods of history, regions, procedural stages as well as the concrete objects also has a different form of its expression. Illegally-obtained confession can be type into 4 kinds such as non-voluntary confessions, illegally-obtained confessions, confessions contrary to the principle of justice, and fruit of poisonous tree and repeated confession, which may not be strictly corresponds to the rules of strict exclusion, relative exclusion and discretionary exclusion. In fact, the boundaries between the above-mentioned types are still very fuzzy, and it is a doctrine of coping with shifting rules by sticking to a changeless principle, to stick to the voluntariness theory, the kernel of exclusionary rules of oral confession.