There were six salification periods, during which more than 20 salt basin with various were formed in the Sichuan Basin size in early Middle Triassic.Based on a large number of statictic on the horizon, thickness, distribution and contents of potassium of the salt boreholes, this paper delineates the distribution of salt basins and centers of salification in each period, which clearly displays eastern Sichuan might have been supersaline and potassium environment from early Triassic late Jialingjiang phase to middle Triassic early Leikoupo phase （T1j5 T2l1-1）. Corresponding, western Sichuan also might have been that in middle Triassic late Leikoupo phase（T2l4）. The Triassic space time structure of salt basins in Sichuan was a resuct of migration of axis of the basin toward west under different overriding and compression coming from Jiangnan oldland and Longmengshan.Meanwhile, the potassium environment happened under the interconnection of continuous dry climate fragments (T1j4-5、T1j5-2 and Tl4-2) in saline cycle the and salt basins window on the strandflat.