Partially coherent vortex beams are generated by the illumination of high-power red-color light-emitting diodes. We investigate the influence of correlation property of partially coherent vortex beams on intensity distribution. The correlation property of partially coherent vortex beams are modulated by adjusting the propagation distance of the incident light. Effects of the topological charge and propagation distance of vortex beams on the intensity are also studied. Experiment results are consistent with theoretical simulations.