Abstract: The form of arbitration agreement is closely related to its effect, so it plays an important role in arbitration system.The regulations of nations' laws and international contracts form, such as New York Arbitration Convention of 1958 and Model Law of 1985, are specifically involved in the form of arbitration agreement. After arbitration system is admitted by law, the form limit of arbitration agreement is gradually becoming smaller and smaller. In au, the form change of arbitration agreement reflects the change of comprehending the arbitration system:from the judicial power's intervening and control of arbitration power to protection and support.