Natural frequencies of the bridge—vehicle coupling system considering uniform distributed load varying with position is investigated in this work.An analytic model of a simply supported beam bridge with constant section is introduced to establish the frequency equations of the coupled system.Comparisons with the results between analytic model and FEM indicate that the present research is correct and reasonable.In view of an example bridge,natural frequencies are studied on the bridge subjected to uniform distributed moving loads in cases of different weight and span,by which some regular phenomenon are obtained.The present study can apply in the engineering problem of interaction between bridges and moving loads such as trains and tracked vehicles. Natural frequencies of the bridge-vehicle coupling system considering uniform distributed load varying with position is investigated in this work. An analytic model of a simply supported beam bridge with constant section is introduced to establish the frequency equations of the coupled system. Comparisons with the results between analytic model and FEM that that the present research is correct and reasonable. In view of an example bridge, natural frequencies are studied on the bridge subjected to uniform distributed moving loads in cases of different weight and span, by which some regularly The present study can apply in the engineering problem of interaction between bridges and moving loads such as trains and tracked vehicles.