Tianjin is the largest economic and trade center in northern China. Tianjin dialect is a representative dialect of Tianjin local culture. Tianjin dialect is a vivid and wonderful flower in the garden of Chinese language and culture. The simple and unsophisticated folk customs of the people of Tianjin produced the warm and humorous qualities of the Tianjin people, which are mainly reflected in the Tianjin dialect. The Tianjin dialect does not refer to the language spoken by people in every part of Tianjin. It usually refers to the dialect spoken by local residents in six districts of Tianjin, parts of western and southern suburbs and parts of eastern suburbs. It is a special phenomenon of dialect island. Since the 1980s, some social language experts have devoted themselves to studying Tianjin dialect. This paper briefly introduces the formation history, phonetic characteristics and special vocabulary of Tianjin dialect island. Through the actual survey, the emphasis is to investigate the current situation of Tianjin dialect and the people's attitude toward Tianjin dialect, analyze the reasons for the change in the use of Tianjin dialect, and forecast the development prospects of Tianjin dialect in the future. More scholars are expected to study Tianjin dialect and study Tianjin dialect. The protection and propaganda of words play a positive role.