The Kuda ophiolite in the northern part of the western Kunlun, China, comprises harzburgites, dunites, chromite pods, cumulate pyroxenites and gabbros, diabase dykes, pillow and massive lavas. The mantle peridotites are mainly Mg-riched harzburgites and characterised by low-Al pyroxenes and Cr-riched spinels, suggesting that the metamorphic peridotites are mantle residue after higher degree partial melting, and similar to the peridotites formed in supra-subduction zone (SSZ). The mantle residual association had been affected by partial melting material of oceanic crust rocks from the related subduction zone and make it rich in LILE, Th and LREE. The cumulate rocks, mainly pyroxenites and gabbros, belong to the PPG-subtype, indicating that the magma of the rocks melted under the H2O-bearing condition in SSZ. The low-Ti gabbros may form in an initial back-arc basin. The diabases and lavas are the transitional MORB/IAB-type basalt. The lavas are richer in Ba, Th and LREE, and lower in Ta than the diabases, suggesting that the lavas are with much clear SSZ signature (high-Th and low-Ta). The palaeoenvironment of the Kuda ophiolite is an inter-arc or back-arc basin in SSZ.