The invention provides a powered parafoil system's air-drop wind field identification method which can dynamically identify the wind speed and wind direction of a wind field that a powered parafoil system flies across so as to provide necessary information for reference to control the trajectory of the parafoil system and the operations for flared landing. The identification process for a wind field is divided into three steps. Firstly, through a GPS module, the positions concerned information of the powered parfoil system can be obtained. Based on the change in the positions of the powered parafoil system, the flying speed and the direction of the powered parafoil system can be calculated. Secondly, the Kalman filtering algorithm is adopted to have the flying speed of the powered parafoil system undergo a filtering process so as to get accurate speed concerned information. Thirdly, the recursive least square algorithm is introduced to online update the identification results of the wind field.