"《说文解字》按文字形体和偏旁结构,把汉字分列540个部首,首创了部首分类编排法,充分反映了上古汉语词汇的面貌。《说文解字》完整地保存了小篆和部分先秦古文字的形体,是我们今人研究甲骨文、金文不可缺少的阶梯,更是研究小篆体的直接样本。 " Analytical Dictionary of Chinese Characters classifies the Chinese characters into 540 radicals according to the structure and component of Chinese characters and it invents the method of arranging Chinese words by radicals and fully shows the features of ancient Chinese vocabulary. In the book, the structures of small seal script and some ancient characters during pre-Qin days are completely preserved. Therefore, it is a ladder for us to study oracle bone inscriptions and bronze inscriptions, and a direct sample to study on small seal script.