Motivation reconstruction is an important mechanism in the development of Chinese characters, which stick to the ideographic feature. Xiao zhuan in Shuo wen is the typical material for studying motivation reconstruction for its systematic feature. The systematic feature ofxiao zhuan's motivation reconstruction is showed in the radical system of Shuo wen, in which both the governance of form and meaning within the radical and the correlation between the radicals were to be realized. The systematic feature of xiao zhuan's motivation reconstruction was due to the coercion of both configuration and meaning composing system as well as the influence of historical and cultural factors. This phenomenon adequately testifies the ideographic characteristic of Chinese characters and reflects the self-organization rules and optimizing trend during the development of Chinese characters.