Abstract: The words and meanings of any language are systematic.In dictionaries,words and their meanings have been collated and summarized to a certain extent,which makes it easier to show their inner systematization.With the help of the “Chinese Holographic Resources Application System”,the direct materials in the four ancient dictionaries such as Shuowen can be linked at multiple levels,so that the complex network relations of ancient Chinese words can be presented more intuitively and comprehensively.Among them,the words with a large number of direct correlation words,which are in the focus position of the explanatory graph,are called explanatory correlation focus words.There are significant differences in the specific distribution and the role of the explanatory focus words in each lexicon,showing different lexical characteristics,but they all have distinct features of the core word meaning,namely,easy to recognize,broad and polysemy,which should be the focus of the study of ancient core words.

Key words: explanations of words in ancient books, explanatory correlation, focus words, lexical-semantic features, core words