The press tests of composite concrete materials with different volume ratio of steel fiber have been carried out under different confined pressures. In light of the complexity of strength, deformation of steel fiber reinforced concrete (SFRC) under triaxial stress, basing on experimental data and fitted formula, the influence coefficients of different confined pressures and volume ratios of steel fiber to peak strength and strain of SFRC is gained, The relational models of the peak stress and strain ratios of the composite concrete materials and confined pressure ratio is established. The analysis results show that the given models can effectively describe the mechanical property of SFRC under different confined pressures.