Abstract: The study of rare reserved ultrahigh pressure metamorphic rocks of oceanic crust is the frontier of metamorphic geology, which is very significant for establishing new type metamorphism of cold subduction zone, exploring the origin of water in the mantle and understanding the mechanism of tectonic exhumation. On the other hand, the high p/T metamorphic belt of deep oceanic subduction associated with the low p/T metamorphic belt to compose a pair metamorphic belt which recorded the geological evolution from slibduction to collision of an orogenic belt. In addition, the recent progress and problems of the study of Western Tianshan UHP metamorphic belt have also been discussed in this paper.