Abstract: Simulating marine salt spray zone and submerged zone in laboratory, the relative dynamic modulus of elasticity and mass loss rate of concrete subjected to salt spray corrosion and seawater attack are determined by the method of non-damage detection, the damage evolutional law, characters and damage degree of concrete are investigated. Meanwhile, the deterioration of concrete subjected to salt spray and seawater environment is analyzed and compared. At last, based on the concept of damage degree, the influences of slag content and concrete strength on damage degree of concrete are deeply discussed. The results show that the change tendency of the relative dynamic modulus of elasticity exhibits 4 stages, and mass loss change represents 2 stages. The deterioration of salt spray corrosion is more serious than that of seawater attack, the damage degree of concrete enlarges with the increasing of slag content, meanwhile, concrete strength has an important impact on it.