Abstract: In order to give reasonable evaluation of combustion state of individual swirl burner, an evaluation method fusing multi-source information based on fuzzy theory was described in detail, and it was applied to evaluate the overall combustion state of swirl burner. By fusing state information of different combustion aeras, an evaluation value was yielded, which denotes the combustion state obviously and comprehensively. Experiment data show that such evaluation value reflects the change of overall combustion state when adjusting working condition of a burner. It is concluded that the discussed method is valid to fuse multi-source information for combustion state evaluation of swirl burner, and provides basis for monitoring, modeling, and optimal control of combustion state of individual swirl burner.