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Regional dialect is an important carrier of cultural heritage in the region, and is an important part of the Chinese national language library. Located in the southwest of Chongqing city as a national positioning of the international metropolis, various cultures of the world gather here together with the flow of people. Chongqing dialect with Chongqing local culture is as the main communication language in Chongqing. The study of speech recognition in Chongqing dialect plays a positive role in promoting the localization of artificial intelligence products. This paper takes Chongqing dialect as the research object, establishes the small corpus of Chongqing dialect, and constructs a speech recognition system using HMM as the acoustic model, and compares the recognition results of Chongqing dialect and Mandarin in Chongqing dialect accent. Experimental results show that the correct recognition rate of acoustic model of Chongqing dialect and Mandarin in Chongqing dialect accent to recognize the corresponding speech was 100%; the correct recognition rate of The Chongqing dialect acoustic model recognize Mandarin in Chongqing dialect accent was 78.89%, the correct recognition rate of Mandarin in Chongqing dialect accent acoustic model to recognize Chongqing dialect was 91.67%.