In order to analyze the effect of freezethaw cycles and strength grades of concrete on tensile property, concrete samples of different strength grades undergoing rapid freezethaw cycles were subjected to uniaxial tensile experiment and splitting tensile experiment. Tensile peak stress and splitting tensile strength were measured and simple mathematical models were proposed. Research shows that as freezethaw cycles increase, the tensile mechanical and deformational properties of concrete are reduced; the higher the strength grade is, the more slowly these properties are lowered.