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To evaluate the effect of lignin on improving laterite soil,the calcium lignosulfonate is utilized to mix into laterite soil,laboratory static and dynamic triaxial compression tests were carried out to study the change law of shear strength indexes(cohesive force and internal friction angle)and dynamic shear modulus of imporved soil.The results indicate that shear strength indexes and dynamic shear modulus first increase and then decrease with an increase in lignin amount.