Unitary constructivism theory in the traditional act on commercial paper is based on non-causative nature of act on commercial paper, which believes that the right of commercial paper is established by declaration of intention on the commercial paper, and the content of declaration of intention can only be confirmed by recording of the commercial paper and declaration of intention on the commercial paper only regards the literary content recorded on the commercial paper as the explanation object. However, as a result of the relative non-causative nature of the act on commercial paper, we should not lump under one head that explanation of declaration of intention on the commercial paper only has the object of literary recording on the commercial paper and at least the situation of relationship of causes between direct parties involved can only constitute content of declaration of intention.