Abstract: Kinetic energy correction factor of gate arch-shaped sections of pressured tunnel has been studied by using FLUENT and MATLAB in combination with physical model tests. The results show three pairs of transverse circulation in the steady turbulence flow in such a tunnel. And when Reynolds number is no less than 4.0×103, this factor takes a value comparable to that for circular section. It decreases with an increasing Reynolds number and hydraulic radius and shows a difference between tunnels of standard and nonstandard gate arch shapes.