Simulations of the global distribution and seasonal variability of methane have been performed using a three-dimensional transport model and the NOAA/CMDL methane data for the period 1984-1987 and large-scale tropospheric fields of the OH radical. The results obtained testify to the ability of the model to reproduce the global atmospheric methane cycle. The seasonal distribution of CH4 in the model is governed mainly by dynamic sources and the chemical sink.