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Since Lha-tho-tho-ri-gnyan-btsan,the Tubo kingship had experienced a long and tortuous progress to reach Buddhism.Based on an analysis of the myths and history in the Tubo period, this essay argues that the main reason for the Tubo tsenpo (king) to introduce the Buddhism was to promote the transformation of Tubo society. The aim was to transform a warrior domain society which was structured entirely by the moral rules and laws of a junior age-set to a more developed political system. The tsenpo constructed a newlyformed group of senior age-set priests through the Buddhism,and thence overcame the constant threat of internal peace by the feudal system of the warrior society.In this progress,the marriage between Princess Wencheng and Songtsen Gampo had shaped the Tubo to a political entity in a brand-new sense. It worked through the modeling of a mythical figure of the Rock Hag as well as using the Geomantic Omen Theory to subdue her.While the upper marriage between Princess khri-btsun and Songtsen Gampo made the Tubo's legal substitution possible. When it reached the generation of Trisong Detsen,Padmasambhava and Zhi-ba-tsho repeated the political function of Princess Wencheng and Princess Khri-btsun, and therefore eventually made the Tubo kingship parallel to the feudal system.