We studied the effects of rainfall on the CH_4 fluxes of soil with box-laser in Robinia psedudoacia stands in low hilly areas of northern China. We also measured the surface soil moisture (5 cm),surface soil temperature (T5),air temperature, relative humidity,and irradiation (R_a)in the forest. The rainfall reduced the CH_4 fluxes of forest soil,and the inhibition effect maintained several days. Before the rainfall,the daily CH_4 fluxes characteristics showed a concave variation. After the rainfall,the variation of CH_4 fluxes was complicated and showed diurnal characteristics ofV-shapeandW-shape. Under different rainfall intensities,although the CH_4 fluxes of soil differed slightly in all meteorological elements,it differed significantly in different times.