Abstract: The problems of measuring the swelling pressure of static cracking agent(SCA) by outer pipe method are analyzed.According to the isotropism of swelling pressure from the hydration reaction of SCA，a new method was presented to measure the swelling pressure.The measuring system composed of electrohydraulic servo tester，displacement sensor and steel cylinder component is designed.The axial displacement control to the SCA paste is carried out to measure the axial swelling pressure of the SCA.The comparison result of the measured data shows that the measuring system and method has sufficient theoretical evidence，reasonable designing in the steel cylinder component and the measuring system，and owns stable and reliable measuring results.The measuring system and the new method are worth to be popularized and applied.Compared with the outer pipe method，this method avoids the impact of the heat output on the measuring result，simplifies the measuring technology and operation，and improves the measuring accuracy and efficiency.

Key words: Static cracking agent, Isotropic, Steel cylinder component, Displacement control, Axial swelling pressure