This paper discussed the evolution of the word “Chufei”。The process of “Chufei” to be a word is rather special, is the result of the integration of that excluded “Chu X, neg Y”(neg on behalf of negative words and phrases) and that emphasized “Fei X, neg Y”. First, the common role of the redundant work, then again the economic principles. Under the mutual cooperation of these two principles, “Chufei” reached a balance between form and meaning. And subjective in the process of “Chufei” to be a word played a very important role, the user leap of logic led to a critical re‐analysis. We think that the process of “Chufei” to be a word is a process of the grammaticalization of structure by reanalysis on the basis of 2 synonymous formats reuse, and is the results of the common role of the redundant and economic principles as well as subjectivisation in language. The mechanism of “Chufei” is the redundant and economic principles in language, and the cause of the evolution is logic entailment and the solidzation of entailment meaning.