On base of the theory of singularity in interfacial mechanics, singular stress field at the interface edge of bonded dissimilar materials in 90° is analyzed. The choices of materials for linear friction welding of dissimilar titanium alloy, solder and filler metal for brazing C/C composite and TC4 alloy are analyzed by stress singularity theory. Result s,hows that matching of TC4/TC17 interface is better than that of TC11/TC17, and can realize better joint through linear friction welding. AgCuTi alloy is fitter for brazing C/C composite and TC4 alloy than TiZrNiCu alloy. Using C/C composite / TiZrNiCu / Cu / TiZrNiCu / Mo / TiZrNiCu / TC4 interface structure can get matching joint for brazing C/C composite and TC4 by TiZrNiCu alloy filler metal.%依据界面力学的奇异性理论,阐述了接触角为90°的对接界面的奇异应力场特征,并以此为基础,分别对异种钛合金的线性摩擦焊材料选用、Cf/C复合材料与TC4钛合金钎焊接头的钎料选择及界面层设计进行了分析,结果表明:TC4/TC 17较TC11/TC17具有较好的界面匹配,更易获得良好的线性摩擦焊接头；选用AgCuTi钎料较TiZrNiCu钎料更适于Cf/C复合材料与TC4合金的钎焊；选用TiZrNiCu钎料时,采用C/C复合材料/TiZrNìCu/Cu/TiZrNiCu/Mo/TiZrNiCu/TC4界面结构进行钎焊可获得较好的匹配连接.
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