Abstract: The potash-resource status of our country is described in this paper. The distribution and forming disciplines of large potash deposits in the world are concluded: foundation of substance, geological constructions, facies and paleo-geography condition sand special climate. The general situation sand the history of the geological evolution of Tarim basin between the late Cretaceous Period and the early Tertiary are analyzed. Then it analyzes the characters of the facies of the late Cretaceous Period and the early Tertiary. And two concentration centers—Kuche sag and Tarim south-west sag are achieved. This paper also reviews the status of seeking potash deposits in Tarim basin. A favorable geological foundation is set up for seeking potash deposits.