In order to improve the accuracyof confirmingrunway orientation methodbased on usability factor and eliminate theerrors that exist in the previous calculation method which is based on the wind rose according to wind statistics of velocity and direction,a new model is proposed, in which wind observation data is used directly to calculate the crosswind component suffered by runway and optimal runway orientation is confirmed by comparing wind data with the allowable crosswind componentand counting the number that meets the requirements. Simulation model by MATLAB program language is established and can calculate and confirm runway orientation directly by observation data. Besides, usability factor in certain runway orientation is calculated by modified methodand compared with the results of previous method and other numerical simulation method, then the accuracy and reliability is ascertained.