Experiments are conducted to determine the distribution of static pressure and pressure coefficient in a pin-fin trapezoidal duct that models the cooling passages in gas turbine blades. The result reveals: (1) When the lateral off-take ration (C) is less than 1, i.e. (C﹤ 1 ), the radial variation of the static pressure is not remarkable. At the entrance and exit of test segment, the static pressure is higher than that in the middle of test segment; the chordwise variation of the static pressure is intense. The changing grade of the static pressure is much larger at the chordwise exit than that at the left of the pin-fin. (2)C=1, the variation of the static pressure of the end wall mainly concentrates on the along chordwise direction. The trend is the same as conclusion one. (3) The lateral off-take ratio's effect on pressure coefficient is much higher than the Re number's. The pressure coefficient is decreased with the increase of C