Water diffusion coefficients and dynamics at adhesive/C-C composites joints were calculated with EDX analysis．For this method does not break the adhesive joints

it’s much simpler than the calculation of water diffusion coefficients and dynamics with elemental analysis．Until now this method was not introduced in referenees Water diffusion coefficients and dynamics in adhesive/C-C composites joints treated by different surface treatment methods were also studied．It was indicated that the water diffusion speed in adhesive/C-C composites joints treated by sand paper was the fastest as compared to those treated by chemical oxidation and by silane couple agent treatment．