Understanding　the　micro-mechanical　properties　and　the　microstructure　of　cement-based　materials　under　the　saline　lake　environment　in　western　China　can　provide　a　scientific　basis　for　the　durability　design.　In　this　study,　cement　pastes　((w/c=　0.35)　and　(w/c=　0.53))　were　prepared　and　soaked　in　brine　solution　to　carry　out　the　dry-wet　cycle　test,　the　chemical　composition　of　which　is　similar　to　saline　lake　solution.　The　micrographs　of　corroded　regions　and　corrosion　products　were　observed　and　analyzed　under　scanning　electron　microscope　(SEM)　and　energy　dispersive　spectrometer　(EDS).　Micro-mechanical　properties　of　different　phases　were　tested　by　nanoindentation,　and　multi-peaks　fitting　was　carried　out　for　the　experimental　frequency　distributions　of　the　indentation　modulus　and　indentation　hardness　by　Gaussian　function.　In　the　meantime,　the　statistical　distribution　of　micro-mechanical　properties　was　summarized　for　the　hydrates　in　corroded　cement　paste,　which　has　included　the　low　density　calcium-silicate-hydrates　(LD　C-S-H　gel),　high　density　calcium-silicate-hydrates　(HD　C-S-H　gel)　and　calcium　hydroxide　(CH).　The　results　show　that　micro　mechanical　properties　of　each　phase　in　cement　paste　after　brine　corrosion　decreased　significantly.　In　addition,　the　water-cement　ratio　has　little　effect　on　the　micro　mechanical　properties,　but　much　effect　on　volume　fraction　of　each　phase.