Abstract: In order to discover the mechanics performances of the steel fiber concrete under the triaxial load effect which often applied to the mine roadway suppor t.with the rock triaxial testing machine, the triaxial test under the different conditions was conducted on the steel fiber concrete specimens.The statistics and analysis of the test data showed that the optimum volume rate of the steel fiber concrete would be about 1.5%2 .0%.Meanwhile, the paper summarized the relationship formula bet ween the ultimate compressive strength and the surrounding pressure of the steel fiber concrete under the triaxial load effect.The higher surrounding pressure, the high er ultimate compressive strength of the steel fiber concrete would be and the plasticity would be better.