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In order to explore the strength of the structures with unsymmetric lap-joints, the adhesively bonded single-lap joints whose adherends were steel sheets, aluminum sheets and steel-aluminum were separately tested in tension loading which created shear across the bondline. The tests were conducted under different temperatures to provide the experimental tension loads for the three kinds of dissimilar lap-joints. According to the method which Wu Z J proposed, the equations of edge-loads were given based on G—R’s theory. The stress of adhesive was obtained through finite element analysis. In addition, the effects of the unsymmetric structure on the strength of joints were discussed.