Study area is located in the central Segment of the northern margin of the North China Craton and adjacent to the XingMeng orogenic belt. LAICPMS UPb dating and petrochemical analysis of three zircon samples from the Amawusu granodiorite yielded UPb ages of 267±9Ma (MSWD=9.7). The Bulong monzogranite and the Geertu muscovite granite formed at 239±4Ma and 238±6Ma (MSWD =0.91), respectively. Zircons collected from muscovite monzogranite vein which intruded into the Geertu pluton, gave a mean 235U/206Pb age of 224±8Ma (MSWD=5.7). Petrochemical data indicate that the Amawusu granodiorite were generated by magma mixing, triggered by extensive underplating; The Geertu muscovite granites show a spectacular tetrad effect in their REE distribution patterns as well as nonCHARAC (chargeand radiuscontrolled) trace element behavior, caused by intense interaction of the residual melts with aqueous hydrothermal fluids. Those characters indicates that the Geertu muscovite granites are not typical Stype granites, belong to postorogenic setting, represented the ending of orogeny. Both the Geertu muscovite granite and muscovite monzogranite vein had suffered intense effect by hydrothermal fluids. So in midTrias,there are extensive hydrothermal (probably rich in F and Cl) activity in this area. More work need to do for make clear that the fluorite in study area are the results of the hydrothermal activity.