Because layered intrusion in Panxi paleorift have a large-scale economical V-and Ti-bearing magnetite deposits, some geochronological study has been done on it since the sixties, the dating techniques included K-Ar, Ar-Ar,Sm-Nd dating et al. The newer knowledge has been acquired by the results of dating. The present paper analyzes the age of the nephline-pyroxenite in ultrabasic ring alkalic complexes of Jijie, Daxiangping and the larered gabbro of Taihe, Xichang by 40Ar/ 39Ar method . These data shows the age of nephline-pyroxenite in ultrabasic ring alkalic complexes of Jijie and Daxiangping rang from 214- 193 Ma, which is consistant with the late Triassic epoch, belonging to Indosinian period. Generally speaking, the emplacement of ultrabasic ring alkalic complexes occurred later than that of the gabbro ore bearing. Wherever, because of the disturbance such as excess Ar etc, the 40Ar/ 39Ar plateau age far higher than its rock-forming age, which suggests the whole rock or pyroxene is not fit to be as the dating object in Panxi area.