The classical weak expansive soil existed widely in Hefei was treated by mixing with randomly and uniformly distributed jute fiber. And a series of direct shear and unconfined compression tests were conducted on soil samples of ten groups including expansive soil and reinforced soil with jute fiber of varying fiber content and fiber length. Besides, the improving mechanism of fiber reinforcement and the effects of fiber length and fiber content on the strength characteristics of jute fiber-reinforced soil were analyzed briefly. Results of this investigation show that:Incorporating randomly distributed jute fiber into expansive soil could enhance observably the shear strength of soil, Jute fiber reinforcement improved the shear failure mode of expansive soil, at the same time, the length and the width of the fractures on the surface of soil specimens after failure reduced largely.