The parabolic interpolation was created by Liu Zhou (刘焯) for dealing with the irregular movement of celestial body in 600 AD. As a numerical method, Liu's interpolation led the mainstream of traditional Chinese calendar-making system thereafter. The characters of mathematical astronomy of Chinese and western differ greatly in their algorithms. Chinese people intended to invent a numerical method such as the interpolation instead of a celestial model as Ptolemy's epicycle-deferent system. Based on a discussion of the evolution of Chinese solar motion theory around the 7th century, the present paper will illustrate why Chinese raised such an idea of interpolation, how they made use of this kind of method, and if it was developed independently.