松赞干布之前的吐蕃史,由于藏文尚未创制,故而信实史料阙如,汉文史料记载也并非都有实据。故而,对于这段吐蕃史的历史年代,只能在后出的藏文史料中的充满宗教意味的神话般传说中寻找蛛丝马迹。本文依照相关史料,根据统计学的或然率,并佐以相关史家的论述,对这段时间的历史年代作一初步的拟测。 Since the Tibetan history before Songtsan-Gampo was not created, the historical records of the faithful lacked any evidence and the historical records of Chinese language did not contain any evidence. Therefore, for this historical era of Tubo history, clues can only be found in the mythical legend full of religious meanings in the later Tibetan historical materials. According to the relevant historical data, according to the probability of statistics and the related historians, this article makes a preliminary test on the historical years of this period.