Abstract: Common knowledge identification is a key link in patent creativity judgment. In the practice of patent examination in
China, the source of the carrier of common knowledge is a little monotonous, and the application of the traditional written carrier
is in the awkward situation of incapability. In addition, limited by the risk of subjectivity in the reasoning and demonstrating of
common knowledge, the rationality basis of this proof model is also quite questioned by the industry. In order to improve the quality
and efficiency of common knowledge identification, it is necessary for China to appropriately expand the carrier scope of common
knowledge and overcome the existing drawbacks of the limited thinking of the source of common knowledge carrier. At the same time,
it is indispensable to strictly define the applicable context of common knowledges reasoning and demonstrating to avoid the improper
abuse of the discretion of the examiners. Common knowledge identification is closely related to the concept and principle of creativity
judgment. To correctly deconstruct the content of the common knowledge rules, we must start from the basic institutional framework
of creativity judgment, trace back to the origin of the institution and grasp the organic connection between the common knowledge
identification and creativity judgment.

Key words: common?knowledge, ?patent?law, ?creativity, ?identification?rules, ?public?domain