In order to solve the problem of insufficient consideration of power handling in the design of bulk acoustic wave(BAW) filters, a method for evaluating the power handling of BAW filters is proposed. First, the average temperature value of each stack of the unit resonator under the selfheating effect is obtained by the acoustic-electromagnetic-thermal multiphysics field simulation of the BAW filter at a specific input power and ambient temperature. Then, the average temperature values are introduced as design parameters into the Mason model to eastablish the Mason(T) model with temperature parameters. Finally, the transmission curve of the BAW filter is simulated in the Mason(T) model, and the power handling of BAW filter is evaluated according to whether all the specifications exceed the standard in the whole temperature range. The simulation results of the case filter show that all the parameters of the BAW filter do not exceed the standard when the input power is 23 dBm and the ambient temperature is in the whole temperature range(-25~85 ℃). However,when the input power is 30 dBm and the ambient temperature is 30 ℃, the upper band insertion loss and outofband rejection of the BAW filter have exceeded the standard, and the performance is significantly degraded.