Abstract: Restudy of lithological and paleontologic analysis of Zhan-Che Sag in Jiyang depression implies：(1)abundances of primary glauconite are different in the 1st to 4th members the Cenozoic Shahejie Formation；(2)reef limestones were found in the eastern part of Zhanhua sag，and Cladosiphonia fossils were found in the top of 4th member of Shahejie Formation；(3)salty water Foraminifera were found through the whole Paleogene；(4)abundant ostracoda fossils were found deposited in the 1st member of Shahejie Formation in Oil well of Gudong 25 before glauconite occurred．These facts further prove that marine transgression happened in this area during the Paleocene．