Preparation of aligned steel fibre reinforced concrete （ASFRC） and the reinforcement of aligned steel fibres on the splitting and flexural tensile strength of concrete were investigated. In the preparation of ASFRC, an external uniform magnetic field was applied to the freshly mixed steel fibre reinforced concrete when the concrete was vibrated to compact. Meanwhile, all steel fibres were subjected to the action of magnetic force. As the consequence, the steel fibres rotated and had the same or similar direction as that of the magnetic field applied. When hardened, the ASFRC was prepared. The results show that the average direction coefficient of steel fibres is 090 or greater, which means that most of the steel fibres have the same or similar direction as designed. The theoretical analysis results show that the tensile and flexural strength of SFRC increase with the average orientation coefficient of steel fibres. According to test results, for the concrete with the same steel fibre content, the splitting and flexural tensile strength of ASFRC is significantly greater than that of normal SFRC.