This article synthesizes a review of the literature on tone sandhi in Chinese and Tai languages. From the synthesis of results from a compilation of linguistic research studies, it was found that the tone sandhi in Chinese and Tai languages... ​​is divided into two types: left-dominant and right-dominant with clearly different patterns of tone sandhi. The tone sandhi in the left-dominant is related with the extension of the tonal to the right. The tone sandhi in the right-dominant has to do