Charged particles are accelerated in a high-frequency linear gas pedal by the axial component of a high-frequency (or microwave) electric field. According to the classification of the acceleration wave used, there are two types of traveling wave and standing wave. The former uses a cylindrical waveguide as the accelerating structure, in which disc loads are periodically set along the axis, so that the phase velocity propagated in the waveguide is less than or equal to the speed of light, in order to accelerate the particles synchronously, and the accelerating field is modeled as class-TM01, which provides the largest axial electric field component in the near-axis region. The latter uses a cylindrical resonant cavity, also periodically set along the axis of the electrode (or drift tube) load, in order to increase the effective accelerating electric field strength, the accelerating field mode is class-TM010, also in the near-axis region to provide the maximum axial electric field component. There are two main types of parameters that measure the performance of the accelerating structure: the first is a parameter related to the acceleration efficiency, in particular the effective tapped impedance. It indicates how high an accelerating electric field can be established by the structure for a given high-frequency power loss. The level of the tapped impedance is determined by the frequency chosen, the geometry and shape of the structure and the amount of variation in the high frequency phase between neighboring acceleration units (mode of operation). Usually the higher the frequency, the smaller the structure size, the higher the tap impedance and acceleration efficiency. The second is the stability of the accelerating structure, which characterizes the effect on the beam current due to errors in the structure and neighboring non-accelerating modes. For the standing wave acceleration structure, the main way to realize the stability is to use the so-called dual-periodic structure, that is, in addition to the periodic acceleration unit formed by the load, but also the introduction of a periodic coupling unit, adjust the position and size of the coupling unit, you can improve the structure of the anti-interference.