The objective of this thesis is study for the Amendment of the Constitution in Thailand. For the Constitution had been resolved successfully by the way of Constitution has defined. For this study has compared in result and the procedure of the foreign Constitution Amendment, for analysis and find the suggestions about the Constitution Amendment in Thailand for develop into the democratization which consider about right and benefit of the public. This study is intended to determine that most of each time the constitutional amendments have the political reasons and to usurpation of power of political power groups more than operate with ideology reasons or the real of the principles of democracy. For this study has found that the constitution amendments in Thailand have often start from the politic conflict and lead to the issues of amendment, the conditions for amendment or not only have the issues involve of the political power and the other often overlooked. For this reason, the process of study and the constitutional amendments in Thailand are not have the aim for develop the Constitution, to promote democratic process or to amend to protect freedom right and to add more population bargaining power, but it is the political phenomenon for politic response that have the power of politic groups that involved about opposition and led to a revolution in the latter. For the purpose of the Amendment of the Constitution have the process to define by the Constitution. There is a suggestion that the population should have political participation for the Constitution Amendment to emphasize the democratic principle. Have liberty and security rights of citizens. To protect the crisis of the Constitution and resolve the crisis in the country and should change and modify attitudes and behavior of politicians to have more respect and focus on the spirit of the Constitution.