The Lower Paleozoic buried hills，as important exploration targets in Jiyang Depression，have the good geological conditions of hydrocarbon enrichment and forming reservoir. A series of large and medium buried hill oilfields（reservoirs）such as Zhuangxi buried hill and Chengdao buried hill etc. have been discovered successively. With the high degree of hydrocarbon exploration，some discoveries have been made with the improved understanding of reservoir forming conditions，and a breakthrough in the exploration of the Lower Paleozoic buried hill have been made as well. Through the analysis of fault property，active time and trap effectiveness，it is considered that the NE strike slip faults with characteristics of inactivity after Paleogene and compression torsion property have certain seal performance，which points out the direction for exploration of negative structural and slope buried hills. Based on the study of the migration ability of the fault connecting to oil source，it is believed that hydrocarbon can transport laterally along the fault under overpressure environment，which activates the exploration of buried hills without directly connections to source rocks. Based on the study of pressure system of hydrocarbon source and vertical transport ability of fault，it is proposed that hydrocarbon can migrate downward along the fault while being in block of migrating upward under the unfavorable environment of overpressure，which makes the exploration of buried hill under the source promising. Under the guidance of new understanding，Well Chengbei 313，Well Chengbeigu xie 14，Well Zhuanggu 65 and Well Chegu 27 have been successively drilled，and a series of hidden buried hill reservoirs have been discovered，by which new prospects for the exploration of the Lower Paleozoic buried hill in Jiyang Depression have been opened up.