The Dianjiang salt basin is one of the most important Triassic Potash- forming sub- basins in the eastern Sichuan basin, where a large number of potassium- bearing minerals have been found within the halite in the fourth member of the Jialingjiang Formation (T 1 j 4). Nevertheless, the favorable potash- forming areas of marine potash still remain elusive and need further study. Based on the systematic collection of the drilling well datain the Dianjiang salt basin, this paper calculated the salt thickness of the T 1 j 4 and analyzed the chemical components of the halite samples. Results show that the salt thicknesses of the Shuanglong area and the Wudong area are the highest. Within these two areas, the potassium content of halite shows a distinctive high level, suggesting that the probable ancient salt lake evaporation and concentration centers of the Dianjiang salt basin were in the Changping and the Wudong areas. Moreover, we reinterpreted three seismic profiles across the Dianjiang salt basin, and employed the magnetotelluric sounding studies on another seven sections. These reveal that the significant sub- depressions favouring potash deposition during the period of Jialingjiang Formation likely exist in the Wudong part in the northern Dianjiang salt basin and in the Shuanglong part in the southern Dianjiang salt basin. This geophysical observation is in good agreement with the geochemical result. In short, comprehensive analyses show that the Wudong area in the northern Dianjiang basin and the Shuanglong area in the southern Dianjiang salt basin may be the favorable potash- forming areas of marine potash during the period of Jialingjiang Formation in the early Triassic. The results of this study may be verified by drilling.