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With the introduction of fly by wire flight control for the large passenger aircraft, the nonlinear problem of the system becomes more and more prominent. For the gust load alleviation system (GLAS), nonlinear factors affect seriously the effect of gust alleviation. In this paper, the aeroelastic model is established by finite element method and dipole grid method. In addition, the paper analyzes the main nonlinear factors in practical engineering, including saturation, rate limitation and delay. Secondly, according to the gust information detected by airborne equipment, the gust prediction and adaptive feedforward control scheme are designed with the acceleration of wingtip, the shear and bending moment of wingroot response as the gust alleviation index, so as to make up for the shortcomings of traditional feedback control. Finally, aiming at the three kinds of system requirements, the paper compares and analyzes the alleviation efficiency with the traditional feedback control. The results show that the nonlinear factors of the system have a significant impact on the effect of gust alleviation. Moreover, the adaptive feedforward control scheme designed by using the front gust detection information has better gust alleviation effect.