Abstract: It is mainly studied the tensile strength of common concrete which is composed of three coarse aggregatesoriginal state gravel, crushed gravel and limestone rubble. The test results show that the uniax ial direct pulling strength of concrete is about 39% ～48% of resistance to bending and pulling strength, but the two-way tensile strength is about 20%～30%, which is lower than its uniaxial tensile strength, showing obviously bidirectional tensile strength weakening effect. For the structure design of common concrete road board which is under the comprehensive action of car load stress and temperature stress, it. s an important problem deserving of deep study.