Sulfate ions in seawater penetration into concrete would lead to damage of concrete in marine environment. In this paper, the air entraining concrete with 0-65% of GGBS content was exposed to marine tidal zone, atmosphere zone and submerged zone for 1~2 a. The water-soluble and acid-soluble sulfate ions profile were tested, and the corrosion products of cement paste in marine environment was analyzed. The experimental results shown that the order of the migration sulfate ion content and transmission depth of concrete exposed to different corrosion zones was in order of:tidal zone>submerged zone> atmosphere zone. The relationship between reactive sulfate ion and total sulfate ion in concrete could be expressed as a linear function. The reacted sulfate ion content accounted for more than 90% of total sulfate ions, and the amount reaction sulfate ion increased with the corrosion time. The amount of corrosion products including ettringite and gypsum were generated in pastes exposed to tidal zone and submerged zone. The corrosion product of concrete exposed to the atmosphere zone was only ettringite. For C40 concrete prepared with P.I.52.5 cement, cement replacement by 65% GGBS helps to improve the capacity of concrete to sulfate ion attack in marine environment.