Abstract: Based on the research results of the isotopic geochronology on the mineralization and the magmatism of the Cu，Ag，polymetallic deposits in the western border and other parts ofthe Lanping basin，it is concluded that the isotopic ages of these two deposits are consistent with those of other deposits in the region，and the mineralization epoch is basically synchronous in regional mineralization of the basin．The copper，polymetallic deposits were formed in a unitary geodynamic background．The mineralization epoch of the deposits is the earlier stage of Himalayan orogeny．The formation of the deposits in the basin is constrained by the evolutionary geological events of the structure and thermal regime in the same time．