When sound film had not yet been introduced, its technology and concept had produced a response in China. The sound film speeches of Youth Association foreign officers in many cities and the screening of foreign sound films in commercial theaters were becoming more and more popular, and the issue of national language in sound films was gradually put on the agenda. Left-wing filmmakers had played an active role in the creation of mandarin Chinese-based sound films, which together with the Mandarin Chinese education movement of the same period constituted an important component of language modernization and popularization. The conflict between Chinese sound film and dialect film actually reflected the contradiction between national character, international character and local character of modern Chinese film. The solution to this problem became the process and result for Chinese language occupying the dominant position of sound film and constructing the national concept in the period of the Republic of China.