The water transport processes in calcium silicate hydrated（C-S-H） nanopores， coated graphene oxide（GO） and coated graphene oxide/silane（GS） composite coatings nanopores were investigated based on molecular dynamics. The results show that the large number of hydrogen bonding sites provided by the GO coating rich in hydroxyl and epoxy groups accelerates the water transport. The GS composite coating effectively binds to the C-S-H matrix through ionic bonding interactions and its exposed hydrophobic tail chains can effectively inhibit the water transport process.