The Lower Proterozoic Yaoshan Group and Ailao Shan Group, composed of highgrade metamorphosed rocks, is a long, narrow belt striking NWSE direction along the Red River fault, and are considered the Precambrian crystalline basement. In this paper, the SHRIMP zircon UPb dating have been conducted on the augen granitic mylonite (08HK1) from the Yaoshan Group (Lianhuatan, Hekou County) and gneissic granite (08JP5, Adebo,Jinping County), and ages of two magmatic zircon groups are 828±6.2Ma (N=11, MSWD=1.8) and 748~801Ma, respectively. In addition, the SHRIMP zircon UPb ages of 769~893Ma were obtained on biotite granodioritic gneiss from the Ailao Shan Group in MojiangYuanjiang section. Combined with the crystal features, CL images and concordant of UPb age, 828 6.2Ma and 748~801Ma should present the crystal age. These ages suggested that there should have the Neoproterozoic magmatism in the study area. The SHRIMP zircon UPb dating on old core from sample 08HK1 has the age of 984Ma, and the 08JP5 sample has the old core zircon UPb age of 1104~1353Ma and even 2655Ma. The old core zircon age show that the Yaoshan area and southern part of Ailao Shan should be a Mesproterozoic or Archea basement. Based on these isotopic geochronological data above and regional geological tectonic evolution, the Yaoshan area and southern part of Ailao Shan should located in the cross region of the Nanhua Rift and the Kangdian Rift during breakingup of the Rodinian Supercontinent in the Neoproterozoic.