The　chloride　transport　characteristics　of　alkaliactivated　slag　AAS　mortars　at　various　degrees　of　water　saturation　were　evaluated　comprehensively　by　means　of　conductivity　tests　diffusion　tests　and　drywet　cycle　tests.　The　mechanism　of　unsaturated　chloride　transport　of　AAS　mortars　was　illustrated　by　characteristics　of　pore　structure　and　moisture　distribution　at　different　degree　of　saturations.　Results　show　that　the　conductivity　and　apparent　chloride　diffusion　coefficient　of　AAS　mortar　specimens　decrease　significantly　with　the　decrease　of　saturation.　In　the　condition　of　drywet　cycles　the　specimen　with　lower　saturation　has　a　faster　chloride　penetration　and　there　is　no　clear　chloride　peak　in　the　specimen.　The　influential　depth　of　drywet　cycles　on　chloride　penetration　is　increased　for　the　specimen　of　a　lower　saturation.　The　apparent　chloride　diffusion　coefficient　is　lower　in　Na2SiO3　activated　system　than　in　NaOH　activated　system　of　the　same　saturation　level　while　the　resistance　difference　of　the　two　systems　becomes　smaller　for　a　lower　saturation.　©　2022　Tongji　University.　All　rights　reserved.