In order to solve the problem which caused by the illusion of replacement in the domain of cognitive development, Klaczynski and his colleagues (2009) argue that the information processing involves simultaneous operations in both experiential and analytic processing. In this paper, the claim above was tested in a strict condition which based on the developmental trend of an ancient Chinese reasoning illusion. And the developmental trend of the ancient Chinese reasoning illusion was discussed also. The results show that: (1)The developmental trend of the ancient Chinese reasoning illusion supported the dual process theory;(2) The ancient Chinese reasoning illusion existed as young as the fifth grade of elementary school. There was no difference among the accuracy rate of the undergraduate students, the senior high school students and the junior high school students.