The parent rock of Pulang porphyry copper deposit is uplex rock masses,which composed by dioritic porphyrite,monzonite porphyry and granodiorite, three type rocks of biotite and hornblende’s 40Ar-39Ar istope age consistent with geological characteristics and research results of petrography.From 212.1Ma→211.0Ma→206.4Ma,which represent the evolutional relationship of from dioritic porphyrite to monzonite porphyry to granodiorite.Obviously,the age break the late indo-chinese epoch which is the Newest and minor istope age data from the Pulang uplex rock masses.It is obtain 199 Ma 40Ar-39Ar istope age from Panan cattle farm monzonite porphyry in this porphyry belt north showed that this area has the continuance of indo-chinese epoch,or there was one stage quite intensity tectonic-magmatic activity and copper multiple metal mineralization. Merely, it is the continuance of indo-chinese epoch,and there was another tectonic-magmatic activity mineralization which problem have no one scholars clearly put forward,So,it is a worth of researching problem in further.