Abstract: In order to study the fiber, fiber cement on the strength of Yunnan red clay, red clay of the improved direct shear tests carried out and the unconfined compression test. The results showed that, to the red clay mixed with fiber, fiber cement, its strength has improved significantly. With the increase of fiber content, improved the shear strength of red clay first increase and then decrease, the incorporation of 0.05% ~ 0.15%, a significant improvement; unconfined compressive strength with the increase of fiber incorporation increased. A certain amount of time in the cement, red clay improved the unconfined compressive strength with fiber incorporation and the increase of age. Improved relative to the fiber in terms of red clay, fiber cement Yunnan unconfined compressive strength of red clay to improve even more apparent.