Abstract: Wind flow around twin-tower tall buildings is generallycomplicated and there is no simple method or laws for determination of theinduced surface pressures on such buildings. Therefore study and predictionof wind effect on this type of buildings are necessary. Based on the windtunnel test of surface pressures on a twin-tower tall building, the windflow around the building was predicted using the time-averaged numericalsimulation technique. The wind-flow characteristics and the law of pressuredistributions were summarized accordingly. Through comparison of thecomputed wind pressures with the corresponding wind tunnel test data, itindicates that the numerical simulation technique is accurate and feasiblein prediction of the wind flow involving strong aerodynamic interference.