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As a key part of the helicopter, the helicopter gearbox can convert power into the power output, so as to meet the need of different forms.Aiming at the technical problem of helicopter gearbox condition can not be accurately forecast, the grey prediction method is applied to the helicopter gearbox, so effectively solve the difficult technical problem of the accurately predict to the status gearbox. Firstly, the vibration signal of helicopter gearbox which have been collected, and the feature were picked up. Then, the paper used the information fusion technology for the characteristics of different values vibration signal to fusion. Finally, the paper used the grey prediction method for helicopter gearbox to state prediction. In this paper, the proposed method is verified by experiment. The results show that the proposed state grey prediction method can achieve the accurate prediction of helicopter gearbox state performance, and the state prediction method has a certain significance for other aviation equipment and machinery equipment.