A　modified　elastic　visco-plastic　(EVP)　model　is　proposed　for　overcoming　the　shortcomings　of　the　current　EVP　constitutive　model.　The　modified　EVP　mode　takes　into　account　the　non-linear　feature　of　semi-logarithmic　compression　curves　for　natural　clays　as　well　as　the　variation　behavior　of　creep　rate　related　to　the　stress　level　and　consolidation　duration　time.　The　available　one-dimensional　consolidation　test　data　of　Ariake　clay　obtained　by　the　constant　rate　of　strain　(CRS)　and　step-wise　rates　are　adopted　to　compare　with　the　calculated　results　based　on　the　modified　EVP　model.　The　results　show　that　the　modified　EVP　model　can　well　reflect　the　dependence　of　the　stress-strain　relationship　on　the　strain　rate,　and　the　calculated　results　based　on　the　modified　EVP　model　agree　well　with　the　tested　results.　Compared　with　the　original　EVP　model,　the　modified　EVP　model　can　reflect　the　inverse　S　shape　of　the　semi-logarithmic　compression　curves　by　introducing　the　bi-logarithmic　compression　relationship.　Besides,　introducing　the　creep　parameters　related　to　the　stress　level　and　time　for　natural　clays　to　the　modified　EVP　model　can　reflect　the　non-linear　decreasing　change　law　in　the　creep　rate　related　to　the　stress　level　and　time.