From the old campus of Southwest University for Nationalities to the new campus of Sichuan University, Jiang 'an Campus: It is more troublesome to take a bus. You can go to the new campus of Sichuan University first, and then take the school bus from Sichuan University to Jiang 'an campus at the school station next to the gymnasium.
From the new campus of Southwest University for Nationalities to the new campus of Sichuan University, Jiang 'an Campus: Take the 804B and get off at Jiang 'an Garden Station, opposite it.
From the new campus of Southwest University for Nationalities to the old campus of Sichuan University, Wangjiang Campus: In the same way, take the bus from Sichuan University to Wangjiang Campus at the new campus station.