Abstract: This paper based on crossplot and core data, analysis the Pu Xi oilfield, Putao Hua oil layer ‘s conventional logging response characteristic. Based on the describe of the three cored wells, Putao Hua oil layer is mainly made up with oil-water zone, and judging the Partial oil or water is very difficult. First normalized the well logging curves, elimination the influence of the nongeological factors to the well logging curves.After that, establishe the logging data intersection, and identify the lithology. The lithology crossplot are mainly depand on △SP, GR, HAC, RLLD, RLLS.ILD, ILM At last ensure the fluid standard.