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The unstable approach caused by the distortion of glideslope endangers aircraft in the forms of over-pitching, stalling at low altitude, and exceeding the limitation of descent rate. Aiming at the issues above, in addition to the conventional instrument landing system, a glideslope stability control model based on the fusion of multi-navigation sensors, INS,Baro-altimeter and GNSS is proposed, and kalman filtering is employed for data fusion to solve the mismatch between the horizontal position and the actual vertical position which avoids the descent instability in the case of glideslope distortion. Finally, model simulations on glide path have been done to prove the effectiveness of the model, and the results show that the control model can enhance the stability of glideslope effectively, promote the success rate of approach, and ensure the flight safety.