Jiaoliao Mandarin is one of the dialects of Mandarin Chinese that coexists with three-tone and four-tone systems. The three-tone system was created by combining the main four traditional tone classes of Mandarin Chinese. This study focuses on the representative points of the three-tone dialect in Jiaoliao Mandarin and analyzes three categories of tone sandhi in the three-tone system. Additionally, the investigation suggests that these three categories reflect the different time stages of tone formation and development in the three-tone system
