This study reports geochemistry, zircon U-Pb and Hf-isotopic data for the monzogranite from the Bulong pluton, west Kunlun. The monzogranites are high-K calc-alkaline to shoshonitic series,with A/CNK values of 1.1. Their low Rb/Sr（0.67 ～ 0. 88 ） and Sr/Y ratios（ 13.2 16.6）, weakly negative Eu anomaly （Eu/Eu ＊= 0. 68 ～ 0.84）, and moderate Sr, Rb contents （ Sr = 214 × 10-6 ～ 247 × 10-6, Rb = 165 × 10-6 ～ 191× 10-6 ） indicate dehydration melting of biotiteand amphibole in the source region. LA-ICP-MS U-Pb zircon dating of the Bulong monzogranite yielded age of 441 ＋2 Ma（ MSWD = 0.33 ） with 8s~（t） values between -5.1 and -2.3 （ average value of -0.3 ）. The inferred protolith is an intermediate crustal igneous rock formed during the period of Mesoproterozoic-Neoproterozoic. Combined with the previous studies,it is suggest that the Early Paleozoic granites distrubuted at both sides of the Kudi ophiolitic melange and almost simultaneous with the Kudi ophiolitic melange. Early Paleozoic granites from the west Kunlun display multi-episodes with forming ages of 507 ～500 Ma, 471 ～468 Ma, 447 ～ 430 Ma and 408 ～404 Ma,which is probably the result of northward subduetion of the Paleo-Tethys ocean.
