The Ziyunshan pluton consists of granodiorites and biotite granites, the former granites ring distribute in its marginal belt, are the main rock type with zircon LA ICP MS age of 222.5±1Ma, which are randomly distributed mafic micogranular enclaves, and the latter granites in its interior part were intruded into the former granites, with zircon LA ICP MS age of 222.3±1.8Ma. The both types rocks are Late Indosinian granites.The SiO2 content of two types of granitic rocks have obvious discontinuity, and A/CNK range respectively 099~0105 and 108~115, the granodiorites are metaluminous to weakly peraluminous I type granites, and the biotite granites are weakly peraluminous to stongly peraluminous S type granites. The two types granites both have high Rb, Cs, Rb/Sr, and (87Sr/86Sr)i values, and low Sr, Ba, Eu, εNd(t)values, slightly to moderately negative Eu anomalies. These geochemical characteristics indicate that they derived from Precambrian metamorphic basement. The different P T conditions and depths of their formation indicate that they have different regions. The two stage granitic rocks of Ziyunshan pluton were formed by the collisional compression and decay between Southern China and Indo China. The ganodiorites with a little mantle component were formed by magmas underplating, then the partial meltling of mud sandy sediments in upper crust produced the biotite granites. The spatial distribution and high precision age data of the Indonian granites in South China show that the rock age of granitic rocks gradually turn new from south to north in Southern China inland belt and Wuyi Yunkai mountains belt, along with the compressive stress transfered from south to north caused by the collision between Indo China and Southern China.