The Huangmeijian quartz. syenite body is a mufti-staged composite body. The results of whole rock Rb-Sr isotope analyses indicate that it is Late Yan- shanian in age. On the basis of the initial 87Sr/86Sr ratio, 87Sr/86Sr---1/86Sr,(87Sr/86Sr);---Rb, Sr, Rb/Sr diagrams and the characteristics of petrology, petrochemistry, and trace elements, it is believed that the Huangrneijian body belongs to the syntexis type and its parental magma was derived fxom the upper mantle, but in the process of its moving upward, the magma was contaminated by the crustal matirials.