Soil　stabilization　involves　modifying　the　physical　and　chemical　properties　of　soil　to　enhance　its　engineering　performance　for　construction　purposes.　Due　to　inherent　variations　in　these　properties,　the　mechanical　characteristics　of　stabilized　soils　can　differ　significantly　across　regions.　This　study　utilized　Portland　cement　and　self-made　cement-slag-based　binders　to　improve　soil　engineering　properties.　Through　comprehensive　physical,　chemical,　and　microscopic　experiments,　the　differences　in　strength　between　acidic　high-plastic　liquid-limited　clay　and　alkaline　low-plastic　liquid-limited　coarse-grained　soil,　the　optimal　Ca(OH)2　dosage,　and　the　mechanisms　behind　strength　development　in　solidified　soil　were　examined.　The　results　indicate　that　the　strength　of　solidified　soil　primarily　arises　from　cementation　between　soil　particles　and　the　filling　of　expansive　products.　Cementation　forms　the　basis　for　strength　generation,　while　filling　is　essential　for　further　strength　development.　Factors　such　as　soil　pH,　clay　content,　and　cation　adsorption　capacity　significantly　influence　the　hydration　products　of　cementitious　materials,　leading　to　marked　differences　in　soil　strength.　Increasing　the　content　of　Ca(OH)2　can　promote　the　formation　of　calcium　hydroxide　silicate　and　hydrated　gypsum,　enhancing　particle　cohesion　and　reducing　pores　larger　than　1　mu　m,　thereby　achieving　a　maximum　28-day　strength　of　6.4　MPa.　Optimal　Ca(OH)2　content　was　found　to　be　9　%　for　clay　and　3　%　for　sandy　soil.　Excess　Ca(OH)2　can　create　additional　interfacial　transition　zones,　affecting　overall　soil　stability.　These　findings　elucidate　the　reasons　behind　strength　variations　in　solidified　soils　with　different　properties　and　offer　valuable　insights　for　practical　applications　in　construction　and　geotechnical　engineering.