Ba–Shu Chinese started to disappear during the late Southern Song dynasty period due to the Mongol conquest of China, which resulted in a massacre throughout the Sichuan Basin.
The language was supplanted by Southwestern Mandarin after settlement by people from other parts of China, mostly from present-day Hubei and Hunan.
[3] Phonological aspects of Ba–Shu Chinese are preserved in the Minjiang dialect of Sichuanese Mandarin, which caused debate on whether the dialect is a variant of Southwestern Mandarin or a modern-day descendant of Ba–Shu.
[3] According to Liu's research, there is enough evidence to assume a significant number of coda mergers had taken place or were taking place in the Ba–Shu language during the Song dynasty:[3] Ba–Shu language had some unique words that scholars identified as possibly being influenced by the Old Shu language.
Notable speakers of the Ba–Shu language include the "Three Sūs": (三蘇, sān sū):