Soluble　salts　in　soil　cause　changes　in　soil　behaviour,　the　extent　of　which　varies　depending　on　salinity　levels.　Salt-induced　soil　deformation　leads　to　various　engineering　problems.　Na2SO4　is　among　the　most　widespread　and　influential　salts.　This　study　focuses　on　Na2SO4　and　investigates　its　effects　on　soil　strength　via　a　series　of　triaxial　tests　performed　in　the　laboratory.　The　study　examines　different　levels　of　salt　and　moisture　content.　Additionally,　the　study　investigated　the　soil　mechanism　through　its　meso　and　micro　structure.　The　research　indicates　that　the　impact　of　salinity　on　soil　strength　is　modulated　by　moisture　content.　In　situations　where　moisture　content　is　low,　salinity　markedly　affects　the　soil　strength;　however,　as　moisture　content　increases,　the　impact　of　salinity　on　soil　strength　decreases.　Salinity　alters　the　shape,　size　and　orientation　of　soil　particles,　resulting　in　modifications　to　the　interparticle　and　charge　forces.　This　ultimately　leads　to　changes　in　the　soil　strength　parameters.