Abstract: Researching and charting micro-structure maps in Gudao oil-field,the configuration models of micro-structure of surface-up and surface-down in a reservoir are classified into eight.Under definite condition of productlon factors,micro-structure with bi-convex and mono-convex on the surface-up is in favour of collecting residual oil,and micro-structure with bi-concawe and mono-concave on surface-up is in unfav our of it.Sedimentary condition,differential compaction and paleog eomorphic feature in sedimentation are mainly affecting factors of mini-structures,and macro-structural setting also affects the models of micro-structure.