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The analysis result shows that from the Spring and Autumn period to the Qing Dynasty, both the frequencies of "Ren" and "Li" record a peak and a bottom "Ren" has its peak in the Sui and Tang period (581-907) while "Li" reaches its climax in the Wei and Jin period (220-42; both "Ren" and "Li" hit their bottom during the Yuan Dynasty (1279-1368). The average frequency of "Li" is higher than that of "Ren" during most of the time (eight dynasties and periods). In general, "Li" is more frequently referred to in classic Confucian work