Abstract: Yanchang Formation Chang-6 reservoir is uppermost oil layer of Mesozoic Erathem in Ordos basin,proving up oil-geology reserves and base oil yield occupy more 70 percent.Recently,along with prospect degree unceasing improving,have new cognition to oil layer appraising and unceasing find new oil area.Yizheng area of Zhidan oil field is among Yanchang Formation Chang-6 oil field which have been found in near years.In this paper,the author analyzed petrodistinction,porosity and permeability conditiun,porous structure characteristic,diagenesis,porous evolution and reservoir distribution character,analyzed influence factors of reservoir conditions,classified reservoir horizons,summarized forming condition of Yanchang Formation Chang-6 low resistor oil layer by analyzing oil-bearing characteristicistics,consider that reservoir physical quality and porous structure is main influence factors; the author question the main factors of oil pool forming and characteristic,and analyzed oil well's output ability,consider that Yanchang formation Chang-6 have favorable prospect exploitation foreground.