In this paper ophiolites in the Western Zhungeer are divided into two types: One of them is assemblage of metamorphic peridotite troctolite gabbro (abbreviated to PTG series); another is that of metamorphic peridotite pyroxenite gabbro (abbreviated to PPG series).The former is represented by the Dalabute and Hebukesaier belt; the latter is represented by the Tangbale and Mayileshan belt. The PTG and PPG series follow Al-rich and Ca-rich evolutional trend respectively. Therefore, two types ophiolites are very different in rock associations, mineralogy, rock chemistry, REE geochemistry and types of chromite deposits.Genetic mechanism of metamorphic peridotite in the ophiolites is partial melting of the upper mantle peridotite. Difference between two types ophiolites is dicided by degree of the partial melting. But, the crust rocks (included to accumulating complex, sheeted sill complex and lava) is formed by crystallization of the magma. The different rock associations of pyroxenite gabbro and troctolite gabbro in the accumulating complex are related to depth of formation of magmatic chambers and oxidation state of magma in the spreading ridge.