Ophiolites belt occur in most of collisional chains around the world and generally mark the suture zone between plates of geological distinctive origins. The Yarlung-Zangbo ophiolites suture zone and related ophiolites are no exception to this concept. Previous extensive survey was conducted during the 1980 Sino-French Cooperative Investigation of the Himalayas. Progress in the ophiolite research field and new developments in the study of modern oceanic crust guided us in the recent field investigation. Our investigated segment spans from Lhazhi, Xigaze to Jinlu, Zedong that makes a stripe some 500 km long. Based on the field survey, we analyzed geochemical characteristics of more than 500 spinel samples from the Yarlung-Zangbu ophiolites, in order to present and discuss geneses and geodynamics of the Yarlung-Zangbu ophiolites. Mineral chemistry has revealed that the Yarlung-Zangbu ophiolites are the product of suprasubduction. This conclusion is similar to that of other related researched in recent years.