Abstract: Catalytic combustion of ultra-low content methane was carried out in a fluidized bed reactor with Cu/γ-Al₂O₃ catalysts as particle bed material; the effects of bed temperature (450~700℃), fluidizing velocity ratio (ω, 1.5~4), and inlet methane concentration (0.3%~2%) on the combustion characteristics were investigated. The results show that the bed temperature is a major influencing factor for the catalytic combustion; methane conversion increases with the bed temperature. When the bed temperature reaches 650℃, methane conversion exceeds 95% with the methane concentration lower than 1%; methane can be almost completely converted when the bed temperature reaches 700℃ and the fluidizing velocity ratio ω is not higher than 2. Methane conversion decreases with the increase of the fluidizing velocity and inlet methane concentration; when ω exceeds 3.5, the influence of temperature on methane conversion becomes less significant with an increase of the unburned methane content. Under a low temperature, the combustion is controlled by the catalytic reaction rate; activation energy E_a and reaction order m estimated by regression are 1.26×105 J/mol and 0.73, respectively. When the bed temperature exceeds 450℃, mass transport limitations turns to an important factor influencing the methane conversion.