Experimental tests on 10 mm cubic concrete specimens were carried out using the servo hydraulic testing machine.  Specimens subjected to equal constant confining pressures of 0, 4 MPa, 8 MPa, 12 MPa and 16 MPa respectively were conducted to investigate the deformation and strength characteristics of concrete.  In addition, strength properties of concrete under unequal confining pressures were also investigated. Based on the test results it was revealed that the ultimate strength increases dramatically with the increasing confining pressure and the strain at peak stress increases even more pronounced. With the increasing minor principal stresses, the enhancement effect of middle principal stresses on the ultimate strength became weak.  The complete stress- strain curves were obtained at different confining pressures.  By comparison with the current literature,  appropriate formulas of concrete strength and deformation were proposed for the engineering purpose.