The　current　coefficient　Ψs　of　correction　includes　many　influencing　factors.　And　numerical　value　of　this　coefficient　varies　widely.　So　the　current　method　was　improved　from　one　coefficient　to　four　coefficients　in　this　paper.　Three　new　coefficients　of　correction　were　considered　to　decrease　composite　ratio　of　coefficient　Ψs　and　put　forward　three　coefficients　to　modify　calculating　result.　Foundation　stiffness,　lateral　confinement　assumption　and　soil　turbulence　were　considered　to　get　the　value　and　method　of　the　three　coefficients.　Consequently　this　study　improves　accuracy　of　numerical　value　of　the　coefficients.