A RedOx cycle is one of the most dangerous factors of anode degradation due to microstructure changes. In this paper, the evolution of anode microstructure during a RedOx cycle caused by a fuel starvation process was studied using electrochemical measurements. After a power generation experiment, the anode microstructure was reconstructed using a combination of focused ion beam and scanning electron microscopy (FIB-SEM). The microstructure changes were quantified for parameters such as the tortuosity factor, tripe phase boundary density, volume fraction, connectivity and average grain size. The three dimensional microstructure reconstruction indicated that the fuel starvation condition might cause significant changes in microstructure morphology. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.