數位方法應用於人文研究，在近幾年逐漸變得重要。數位方法不但增進了學者的研究效率，也提供了另一個角度去思考各種文本。然而，目前仍然有許多技術或方法有待深入探討。本文研究動機運用了齊夫定律偏離值計算來找出文本的關鍵詞，並以《新青年》為文本來分析是否可行。本研究特點是將關鍵詞的概念加以量化，並從統計理論出發得出一個較客觀的指標。實驗結果發現，利用此統計與數位方法，除了解決主觀判斷的爭議外及減少人工篩選的負擔外，也具有三項突破。一、能夠更加準確地將關鍵詞篩選出來，從而更加細緻地觀察思想變化，以及反映在文本上的語言現象，前者透過「國家」與「青年」這兩個關鍵詞來說明，後者透過「他們」、「我們」、「社會」、「主義」、「階級」、「產階」來說明；二，印證了偏離值大小能夠代表詞的關鍵性，從而揭示出《新青年》的思想變化，從無共識觀念，到思想討論，最後到意識形態確立的過程；三，印證了關鍵詞詞數能夠部分反映文本的思想變化，由於觀念濃縮於關鍵詞，關鍵詞的多寡能夠反映明顯觀念的多寡。

Application of digital methods on art and humanity studies had become crucial research in recent years. Digital methods can help to improve the efficiency of studying, and also to have another point of view to rethink the materials. However, We have a lot of issues that need to be studied in details. Our aim is to proposea residuals calculation based on Zipf's law, in order to find out the key-words of the materials with using ＂Xin Qing Nian＂ as an experiment example. We redefine the concept of keywords in a quantitative way, and establishing anless-subjectivecriterion from statistical theory. The experiment had found out that, as using statistic and digital method, we have three breakthroughs others from diminishing the criticality controversy by subjective judgments and the burdens of manual Selection. First, as the reason of be able to assure more accurately of the key-words, we can have more precise observation to thoughts changing and the language phenomena. Second, giving an evidence of how the importance of the key-words can be demonstrated by residual quantities. Third, giving an evidence of how the quantity of keywords can more or less demonstrate the emerging of obvious ideas.