Soft　soil　in　the　Minjiang　estuary　was　reinforced　by　using　cement　and　fly-ash.　Compression　strength　of　stabilized　clay　with　different　mixing　amount　of　cement　and　fly-ash　is　tested　at　different　curing　ages.　The　microstructures　of　stabilized　clay　samples　are　studied　by　means　of　scanning　electron　microscope　(SEM).　The　results　show　that　the　intensity　of　stabilized　soil　is　the　largest　by　using　the　stabilizer　composed　of　16%　cement　mixing　ratio　and　40%　fly　ash　mixing　amount,　and　it　is　reduced　with　the　growth　of　the　water　content　of　soft　soil　and　is　increased　with　the　growth　of　the　cement　mixing　ratio　and　curing　age.