With the deepening of the new curriculum reform, we should pay attention to forward-looking and innovative thinking in the current physical education classroom teaching, and what language to use is also one of the important means of physical education teaching. For junior children, teaching in English and Chinese alternately can not only arouse students' enthusiasm, but also make teaching more vivid and achieve the purpose of happy exercise.

(1) The principle of conciseness and accuracy. In other words, the description of technical movements in many complex comprehensive exercises in teaching should be as concise as possible, with special attention to the use of common words to explain, and at the same time, the use of uncommon words should be avoided as much as possible, so that students can easily listen, remember and understand in the initial stage of skills. On the basis of concise expression, it also pays attention to the flexibility of language use, that is, different common words are used to describe and express the requirements of the same exercise or the same technical action, thus playing a subtle role in students' mastery and flexible use of foreign languages.

(2) Listen, speak and talk about the principle of synchronization. In physical education teaching, explanation, observation and imitation are everywhere. Any action not only has its clear meaning, but also the direct description of language is a necessary link to understand and master the technical action. Therefore, in the process of bilingual teaching, we should observe the movements when listening, practice with body movements when listening, and prompt with our peers or our own language. In the same teaching process, it is necessary to ensure that students listen, watch, talk and do, which not only deepens their understanding and impression of the main points of technical movements, but also has a good effect of language intensive practice.

(3) Situational principle of technology and language practice. That is, the design of teaching organization: physical education class, with a more relaxed outdoor classroom atmosphere, is the favorite of primary school students because of its own development characteristics. Besides, students are quite interested in English learning. The organic combination of physical education and English will capture the interest of most primary school students and achieve the effect of bilingual teaching. Therefore, physical education class is the best subject for bilingual teaching in primary schools.