Based on the axial cone mirror and the Rayleigh-Sommerfeld vector diffraction theory, a detailed theoretical analysis of the generation of non-diffracted light and the light field after the generation is carried out. The spatial light field distribution and the on-axis light intensity distribution curve of the two non-diffracted beams are simulated by numerical simulation, and based on the processing technology of the conical mirror, the light field analysis of the conical angle of the conical mirror and the beam emitted from the first and second axis conical mirrors are carried out. The results show that when the conical angle of the first-axis conical mirror is smaller than that of the second-axis conical mirror, the light intensity of the outgoing beam in the interference coincidence region is a coupled superposition of the two parts of the light field, and a new non-diffracted beam is generated; conversely, the two diffraction-free beams do not coincide and continue to maintain their respective non-diffracted characteristics. Second, the outgoing beams are distributed in concentric rings along a cross-section perpendicular to the transmission direction, and the radius of the concentric rings varies with the transmission distance. In this paper, the intensity distribution, beam distribution and ring diameter of the two non-diffracted beams are tuned both theoretically and numerically, which is an important guideline for the application of non-diffracting beams in large scale space precision measurements and particle micromanipulation.