Aiming at the situation that target threat assessment lacks the fusion information of operation intention under the uncertain information condition, a method of target threat assessment based on the IFIOWA operator with operation intention information fusion is proposed. Based on the intuitionistic fuzzy set theory, the intuitionistic fuzzy induced ordered weighted averaging(IFIOWA) operator is used to aggregate information under the uncertain information of the battlefield target. Then the operation intention information and index value measurement of knowledge are fused as the induced value of the IFIOWA operator by using the grey correlation group decision making method. Multi type fusion weights for the IFIOWA operator are calculated using the least square method by fusing the weights based on the index ranking position and the weights based on the evaluation information. Finally, the IFIOWA operator is used to aggregate index information, and the closeness of ideal solution method is used to calculate target threat degree. The example of threat assessment illustrates that the method proposed can fuse target operator intention information, and the assessment result is reasonable and effective.