Abstract: The Majorana transition frequency shift in cesium beam atomic frequency standards is theoretically investigated in this paper. In terms of analyses of a multiple energy level and multiple resonance system a physical mechanism causing the frequency shift is considered that transitions between Zeeman sublcvels induced as a Cs¹³³ atom pass through spatially changing magnetic fields disturb the phases of the states corresponding to the two energy levels on which a cesium beam atomic frequency standard operates, and this process coherently inserts in that of the Ramsey microwave resonance and finally its frequency shift occurs. Based on that, some experimental phenomena related to the Majorana effect in cesium beam atomic frequency standards are explained and some of methods for judging a reduction of the Majorana transitions are proposed.