According to the regional geological surveying data from the Gerze area, Xizang( Tibet) (1 : 1000000) and 14 zircon-single Pb-Pb ages (3204-509 Ma) from the low-metamorphic rocks in Gomo Ri and Guoganjianian Mountains, some geologists constructed a Pt-Ar lithostratigraphic system and proposed a two-layer structure model with a hard crystallized basement and a soft basement. But some geological data have made certain that those zircons came from debris sediments, and that those ages could not represent the diagenetic and metamorphic time. The author has obtained 384 Ma Zircon-single isochron age from the Douguer gneiss (which was thought to be Paleoproterozoic before) , 346 Ma Rb-Sr isotopic age from the volcanics deposited under the early Carboniferous layer to the east of Riwanchaka (which belonged to AnD before) and 318 Ma Rb-Sr isotopic age from the basalts interbedded within the Mayer Kangri Formation. During the field study, the author also corrected the angle unconformity between the basement and the Carboniferous-Permian cap rocks to the conformity. On the basis of the analyses for the field geological occurrence and the isotopic ages, a question related to the basement and its two-layer structure of the Qiangtang micro-plate was put forward. At last, the author thinks that most low metamorphic rocks are thought to be Carboniferous and that the previous conclusion about the Pt-Ar lithostratigraphics, metamorphic times, two-layer basal structure and the evolution is not true because it resulted from the misuse of isotopic ages.