Abstract: The tectonic evolution of west Tianshan includes three deformation cycles and six deformation generations, which bear close relationship with sedimentary, metamorphic and magmatic events. The first deformation generation (early palaeozoic or earlier) is characterized by tight fold compression schistosity and injection of magma. The second generation (Sflurian to Devonian) is indicated by ductile shearing and structural transposition and by melange zone and metamorphic zone of high pressure and low temperature. The third generation (Carbonf’erous to early Permain) results in nappe structure, superimposed fold, and metamorphism of lower greenschist facies. The fourth generation (1ate Permian to Triassie) is consistent with late orogenic extension and stress relaxation with resultant extensional faults, tensile breccia, intrusion of A –type granite and extrusion of basaltic magma. Orogenic belt obducting and strike-slip faults are characteristic of the fifth deformation generation (Jurassic to Eogene). The sixth generation (Neogene to Quaternary) are characterized by block faulting with obducting and strike-slip movements. Based on the study of the deformation succession, theoretical bases are provided for understanding the geologic history and for prospecting mineral deposits of the West Tianshan area.