Six surfaces were propared with different surface division patterns for the experimental investigation of steam condensation heat transfer charactc rlstics for dropwise and filmwise coexisting (DFC) condensation surfaces under atmosplmric pressure Dropwise condensation (DWC) was promoted with an uhrathin poly tetrafluorethvene (PiFE) fiim, which was prepared by the dynamic ion-beam mixed implantation (DIMI) method. The results showed that the eondensatiou phenomena at the intersection between the dropwise and filmwise condensation regions wer (quite different ior different relative positions of the dropwise and filmwise condensation regions. The experimental results revealed that the condensation heat transfer characteristics were highly influenced by the surface division number and the relative area ratio of the dropwise and filmwise eondensation regions. The impact of these findings on heat transfer enhancement mechanism for condensation heat transter is discussed in detail.