Considering the importance difference of evidence when applying the evidence theory to fuse multi-symptom-domain during fault diagnosis of rotating machinery,this paper adopted the evidence entropy to estimate the importance of evidence,i.e.the weight of each piece of evidence.Then,the evidence was adjusted according to the different weights,and the weighted adjusting evidence was fused by the D-S combination rule,so that the final diagnosis result was obtained.Finally,by a practical example,the result shows that the method can estimate importance of evidence and reduces the contradictions among different pieces of evidence.So,this method is effective in diagnosing faults of rotating machinery.