In view of the problems in ship-borne helicopter support capability evaluation,such as the data is incomplete,and the decision-makers preference needs to be considered in evaluation,a model for evaluating the ship-borne helicopter support capability based on deviation preference method was studied.On the basis of investigation and the reality of ship-borne helicopter support,a support capability evaluation index system was constructed,and a reciprocal judgment matrix for evaluation subjects was established according to decision-makers preference.A deviation preference method was adopted in support capability evaluation,the weight of each index was redefined from the perspective of sequencing the evaluation subjects,and a deviation function of the value with preference matrix was established.Its shown by case analysis that this model is more practical and simple in process,which is suitable for current study on the support capability evaluation problem of ship-borne helicopter and is of some application value.