The interfacial microstructure of SiC fibre reinforced Ti-22Al-23Nb-2Ta alloy composite, which was prepared by hot pressing of magnetron sputtering coating precursor wire, was investigated by analytical electron microscopy （AEM）. A new interfacial structure, consisting of fine grain TiC＋TiSi, equiaxed TiC and（Al, Ti）Nb2 phase layer, was found at the fibre /alloy interface of the composite. A formation mechanism of the interface is proposed as follows： the reaction of Ti with C-coating formed TiC, as a result, Nb rich zone appeared in Ti-depletion layer beneath TiC layer and formed （Al, Ti）Nb2 phase.
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