Literature Review of the Study on Tubo

Tubo period(6AD to 9AD)is very important stage in Tibetan history.People had stronger sense of ethnic identity and Tibetan ethnic groups were powerful ever.The study on this period,which makes a better understanding of the past of Tibet,is very important in the domain of Tibetan study.The paper reviews the studies in the late 20 years,based on which the characters of the study are analyzed along with the shortcoming in the former research.