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The authors establish model joints thai combine slip critical high-strength bolts with different diameters and related to different fillet weld leg sizes, and consider (he effects on the bearing capacity by different number and different layouts of the bolts, then determine reasonable matches between the high-strength bolts and the fillet welds in combined joints. The authors establish the load-deformation characters of the combined joinis, and research factors that influence the carrying capacity. The way in which these individual elements interact with each olhcr and how much resistance each contributes to the connections can be determined. A design recommendation formula of the bearing capacity and design advice is put forward.