More than sixty beds with nearly one thousand meters in thickness of salts and other evaporites are developed in Shahajie formation (Tertiary) Dongpu Depression. Since the evaporites deposits have close relations to the formation and storage of oil and gas, so its origin have drawn much attention for many researchers in last few years. Suggestions of high mountain-deep basin and thermo brines from deep layer dewelling up along fault are more popular in these considerations. In contrast to the suggestions mentioned above,  model of sea water fed to an estuearine setting episodically caused the evaporite deposits is proposed in this paper.
The saline deposits in Shahejie formation can be classified into 12 units and its precipitated from brine may be started from middle and late periods of Shahejie formation after the sea water invaded to the palaeovalley between Lanliao fault and Chongyue fault when sea level rising.The total 12 units of saline deposits are thought to be precipitated starting from the middle and late sedimentary periods of Shahejie formation. At that time the seawater invaded to the palaeovalley formed by Lanliao fault and Chongyue fault (NE direction) and retentioned by barrier which caused probably by Synstrike-Slip fault of Gaopingji-Xichengji (EW direction). After Sea level dropping the retentioned seawater was concentrated in the deep or shallow settings of the drowned palaeovalley (estuarine) and evaporites precipitate took place.Based on the study of ichnology and sedimentology twelve times of sea level changing probably happened in the sedimentary period of Shahejie formation. It is worth to note here that the 12 units of saline deposits coincidence with times of sea level changing may shouldn't be surprising.