A systematic investigation on major and trace elements and Nd-Pb isotope geochemistry date of the Laochang basalt in western Yunnan Province shows that the basalt is a typical oceanic island basalt (OIB). Nd-Pb isotope data revealed that basaltic magma contained enriched mantle component. The basaltic magma activity in Laochang may be related to mantle plume, and the basalt may be the mixed products of mantle plume (asthenosphere) melting of the magma and enriched lithospheric mantle magma.