This paper first analyzes the causes of phonological and lexical changes in English linguistics and discusses the main manifestations of English phonological changes and phonological and lexical changes. Then, it constructs the evaluation model of English linguistics using the dominant correlation method based on the entropy value, approximation ideal, and gray correlation methods. Finally, data on phonological and lexical changes are analyzed about the development of English linguistics in the past sixty years. From the analysis of factors affecting English vocabulary change, the historical factor responsible for vocabulary change is the development of human society, and the factor value currently stands at 0.428. In comparison, the social, psychological, cultural and foreign language factor values reach 0.654, 0.458, 0.512 and 0.461, respectively.