In order to complete the transmission and transformation theory of multilevel non-diffracting beam and to expend the application range of two stage non-diffracting beam, the light field distribution of two stage non-diffracting beam was analyzed in detail on the basis of the axicon method and Fresnel diffraction theory. Based on the axicon method, an experimental platform for generating two stage non-diffraction beams is constructed. The cross section spots and their light intensity distributions transmitted along the optical axis at different distances are obtained. The influence of different incidence angles of parallel beams on the propagation and transformation of non-diffracting beams is investigated. Experimental results show that the two stage non-diffracting diffraction light field is composed of four regions, in the interference overlap region, the light intensity is the superposition coupling of the diffraction fields of the first and second axicons, the rest of the region remain the propagation characteristics of the single stage non-diffracting beam. The light intensity is influenced by the incident aperture and the bottom angle of the axicon lens. The rupture degree of the spot is positively correlated with the inclination of parallel beam. In this paper, the spatial propagation characteristics, the intensity distribution characteristics and the influence factors of the light intensity are analyzed in detail, which has an important directive significance to extend the application field of multilevel non-diffracting beams.