To deal with the problem of stress concentration and component failure at the right-angle area of I-shaped combined steel lead damper, an oval steel-lead damper (OSLD) composed of steel and lead was presented, which had advantage of simple manufacture process and good energy dissipation capacity in the two horizontal directions. Plane stress analysis of the steel plate of OSLD was performed. The mechanical property tests of OSLD were carried out, and the nonlinear analysis model was established by ANSYS, of which results were compared to the test results. The shaking table tests of a six-storey steel frame structure model with and without OSLDs were performed and compared. Research results show that the numerical simulation results are in agreement with the test results, which indicate that the method of establishing numerical model is correct. The OSLD has full hysteresis curves and good energy dissipation capacity, and the OSLD has well vibration control effect of seismic responses on multi-storey structure.