The majority of people living in Sichuan today are Han Chinese. Abiding by the 20 year rule, the majority of people living in Sichuan in 1997 were also Han Chinese.

According to the Baidu Encyclopedia entry on people of Sichuan, there had been numerous migrations into Sichuan from the rest of China during the Qin Dynasty, between the end of the Eastern Han Dynasty and the end of the Western Jin Dynasty, between the end of the Tang Dynasty and the beginning of the Southern Song Dynasty, during the Yuan-Ming transition, during the Ming-Qing transition, during the Second Sino-Japanese War, and after the founding of the PRC.

Modern day people of Sichuan do have a unique regional identity (so do people of other regions), there are also a lot of ethnic minority groups, but there's is no separate national identity.