Research on tracing isotope Sr,Nd,Pb composition of the meso-basic dikes in Xiaoqinling and Xiong’ershan area in Southern edge of North China craton, it shows that the dikes have much more parental relative characteristics to Yangtze plate, so it proved that the Qinling orogenic belt was formed by evolution of continental dynamic process with Yangtze plate and it attached south Qinling oceanic crust subduction under Southern edge of North China craton. Combined with deep geophysical information in Qinling orogen, we think that activation of the Pacific tectonic domain is fundamental factor for lithospheric extension and tectonic evolution process for Qinling orogenic belt in late Mesizoic. Under inpaction of the Pacific domain Mechanism, there are large scale of granite and meso-basic dikes emplacement in shallow crust in Xiaoqinling and Xiong’ershan mountains area.