理据重构是汉字发展的重要机制，它体现出汉字对表意性的顽强坚持。《说文》小篆是考察汉字理据重构的典型材料，其理据重构具有体系性。小篆理据重构的体系性体现在《说文》部首体系中，它既要满足部首内部的形义统摄，又要实现部首之间的形义关联。《说文》小篆理据重构的体系性源自构形系统、构意体系的共同制约，并受到历史文化因素的内在影响。这一现象充分体现出汉字的表意本质，反映出汉字发展过程中的自组织规律与优化趋势。

Phonetic Complement of the homophone system in ShuoWencame from different periods. The Character-building ability of the same phonetic complement is different in different periods. According our study, more than half of the phonetic complements in ShuoWenhave already existed in the Shang Dynasty. Only 10%-20% of the phonetic complements were appeared in the other periods. Almost a third part of characters which existed in the Shang Dynasty were largely chosen as phonetic complement at that time.