Since the 1980's, BOT has become a popular form of project financing for the government to build the infrastructure with private capital which will be transferred to the government at the end of the concession period. Due to its complexity and risk involved, many failure cases can be found in those countries using BOT.The biggest Build-Operation-Transfer(BOT) project in the world, Taiwan High Speed Rail(THSR) from Taipei to Zuoying with a length of 345 km and a total cost of NT 555 billions successfully began operation on January 5, 2007. Not only has this HSR become crucial and necessary for Taiwan's mass transportation, but also it has established itself as an important role of Taiwan's economic development. However, after two and a half years operation, THSRC had funded by private means was seeking assistance from the government because of such problems as high interest rates, high depreciation and lower ridership than its original projection.With the theory of Graham T. Allison, this text analyzes THSR's policy-making process. The influence of bureaucratic politics wherein the administration sectors and the legislature leads the executive sector as the main role to implement the BOT policy of THSR. Furthermore, the research also explores the interaction and relationship of the relevant policy-making systems among the authoritative MOTC and MOF and legislature sectors on the development of BOT policy.