The purpose of this thesis is to study theconstitutionality of the revolutionary order! and thebody exercising power to examine such orders bycomparing the situations in Thailand and in some othercivilized countries. In Thailand,there was a differentprocedure in controlling the constitutionality oforders as the competent body had been changed severaltimes in particular when the constitution was repealedaccording to the revolution. Therefore, it must beconsidered that which body should exercise the power. According to the study from the decisions of theThai Constitutional Tribunals and of the Courts ofJustice as well as the control system of the othercountries, the control body should be a permanent oneand the examination should be made only after theeffectiveness of the orders. This is because thecontrol over the legality of the announcement of theorders is different from the control over theconstitutionality of the substance of the orders. Inthe late case, the objectives of the announcement andthe purpose of enforcing such orders as laws must betaken into account,while in the former case,it mustconsider whether there is any provision of lawempowering such announcement. However,it should benoted that the illegality of the announcement of ordersdose not always make the orders unconstitutionality. In conclusion,it should be proposed that thereshould be a permanent body to control over theconstitutionality of the revolutionary orders inThailand. Such body must separate from the civil,criminal and administrative procedures except during inthe revolution or the state of emergency: which thereis no a special body to exercise the power. In thatcase, the courts of justice as a permanent judicialorgan shall exercise the power.