The effects of substrate temperature during the low-power plasma spraying (2.5~8.0kW) and subsequent annealing on the phase transformation of Al-Cu-Cr quasicrystalline coatings were investigated. Compared with the original powder mainly composed of icosahedral I-Al 65 Cu 24 Cr 11 quasicrystalline phase and monoclinic θ-Al 13 Cr 4 , the coatings show an icosahedral quasicrystal I-Al 65 Cu 24 Cr 11 and its body-centered cubic approximate phase α-Al 69 Cu 18 Cr 13 . XRD patterns indicated that, for identical spraying condition, a rise in substrate temperature resulted in an increase of the I/α peak intensity ratio in the coatings, and the crystalline phases of AlCu 4 and Al 86 Cr 14 were observed in the coatings after annealing at 1113K for half an hour.