///This paper deals with the emplacement timing of the intermediate-acidic intrusive rocks in Jiama of Tibet and its metallogenic significance. Based on the measured geological data and LA-ICP-MS U-Pb zircon ages of the four intermediate-acidic intrusive rocks, the authors preliminarily regularized the timing sequence, which is from early to late in order of porphyry granite (15.31 Ma~16.27 Ma)-quartz diorite porphyrite-adamellite porphyry (14.81 Ma)-granodiorite-porphyry; Exemplified by molybdenum, the Jiama ore deposit assumes three periods of metallogenesis, i.e., the ore-forming processes corresponding respectively to different degrees of magmatic activities of porphyry granite or quartz diorite porphyrite, adamellite porphyry and granodiorite-porphyry. The Jiama ore deposit resulted from the superposition of the three periods of magma-mineralization.