The cluster head selection and clustering methods play a key role in practical applications of wireless sensor networks (WSNs) to disaster information systems. This paper introduces the considerations of WSN clustering methods for disaster information systems, the low energy adaptive clustering hierarchy (LEACH) algorithm, and improved clustering methods. Then, based on the LEACH, the system simulation and performance analysis have been implemented for large-scale environments. It is believed that the simulation results presented in this paper will benefit the future design of clustering methods.