Experiments were conducted to determine the distribution of static pressure and lateral mass flow rate in a pin-fin trapezoidal duct that modeled the cooling passages in the gas turbine blades.The ratio of lateral-to-total flow rate was 1.The flow Reynolds numbers were varied from 1.5×104through 9×104.The results show that the pressure drops along chordwise passages are much larger than that along radials.The lateral flow rates near the root and the tip of the blade are larger than that in the middle part by 5%～30%.