We advocate the in-depth integration of information technology and education in the digital age, and we also encourage teachers of all disciplines to actively carry out online and offline blended learning. This study attempts to use an empirical research to apply the Blended Learning to the oral English teaching in the first year of senior high school. A one-semester teaching experiment is conducted to explore whether there is a significant difference in the students' oral English proficiency between the experimental class and the controlled class. The major findings of the study are as follows: (1) There are significant differences of students' oral English proficiency before and after the experiment in the experimental class and the controlled class; (2) Blended learning can improve students' oral English proficiency, among which pronunciation and intonation, range and accuracy of vocabulary and fluency of language are the most significant ones, while the accuracy and complexity of grammatical structure are insignificant.