过失速非定常气动测力和大迎角动导数等实验数据是动态的，其背景噪声和机械振动对天平测力的干扰很大，有时无法获得有用数据，为此必须对数据进行数字滤波处理。本文主要介绍数字滤波器的建立和应用，以及滤波器参数的选择对气动特性的影响。 Stochastic experimental data such as unsteady aerodynamic force at high stalling and dynamic response at high angle of attack are dynamic, and the background noise and mechanical vibration interfere greatly with the force measurement of the balance, and sometimes can not obtain useful data. Therefore, the data must be digitally filtered . This article describes the establishment and application of digital filters, as well as the choice of filter parameters on the aerodynamic characteristics.