This paper presents a laboratory investigation on the strength behaviour of the admixture of soft silty clay improved by polymer-fiber and cement. The test results show that the strength of the admixture is related to the length, content of polymer-fiber and cement content. When the cement content is less than 4%, the strength increases with the increase of the fiber content linearly. However, when cement content is greater than 4%, there exists threshold for strength with the fiber content. When cement content is 4%, the fiber content for maximum strength is from 1% to 1.5%; when cement content is 8%, the fiber content for maximum strength is from 0.5% to 1%.The length of fiber also affects the strength of admixture; the strength increases with the increase of the fiber length only when the fiber content is 2.0% or higher. However, when the cement content is 2%, 8%, the strength decreases with the increase of fiber length at low fiber content. When the cement is 4%, the strength increases significantly with the increase of the fiber length at low fiber content. Besides, the strength of the improved clay is also related to the cement content. The strength will increase significantly with the increase of the cement content.
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