The influences of fluid velocity on lateral and vertical static force responses of aqueduct were studied by contrast calculation using threedimensional finite element model. The results show that although the influence of fluid velocity on lateral displacement and moment of the aqueduct is evident and increases with fluid velocity, yet within a velocity range of 1.0-2.5 m/s the influence is limited. The influence of high fluid velocity on vertical displacement and moment is larger than that under low velocity. However, in a range of 1.0-2.5 m/s, the influence can be negligible.