At present，the Gaoji oilfield has gone into middle and later stage of exploration.In order to enhance the oil recovery，it is necessary to study the potential of remaining oil.The sixth block is the main block of stable production in Gaoji oilfield.On the basis of fine reservoir description of the sixth block，the Funing formation，based on the research of sedimentary micro-facies，interbeds and flow units in Funing formation of the sixth block，combined with dynamic data，the controlling factor and distribution modes of remaining oil in this area，is analyzed thoroughly herein.The results show that in the vertical section，different combinations of flow units and space allocating relation of interbeds can form different remaining oil enrichment modes；while，on the plane，the remaining oil distribution is mainly determined by sedimentary micro-facies，distributing feature of flow units and plane heterogeneity.On the basis of the identification and distribution on formation mechanism of remaining oil，4 remaining oil types are distinguished in this area，which are micro-facies differential remaining oil，small barrier remaining oil，interlayer remaining oil and flow units oil.Within the sand body of small barrier and interlayer，the overflow shore sand deposition on the wing and space ofⅡ，Ⅲflow unit is enrichment area of remaining oil.On the remaining oil distribution research，it can improve the effect of sixth block by means of injection and ensure Gaoji oilfield’s production.