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A series of AlCoCrFeNiTix high entropy alloys were fabricated, and their phase and microstructure were investigated. The characterization of body-centered cubic (BCC) phases in XRD pattern was studied. Results indicate that the BCC phases in AlCoCrFeNiTix high entropy alloys are characterized as Fe–Cr and AlNi phases separately. The lattice parameters calculated from the selected area diffraction patterns of Fe–Cr rich phase and Al–Ni–Ti rich phase agree well with those determined in the XRD pattern. With the increase of the content of Ti element, the single BCC peak transforms into BCC1 and BCC2 peaks.