Abstract: The present invention provides nucleic acid markers for rapid diagnosis of KD and a kit for detection of the nucleic acid markers. The nucleic acid markers are 4 miRNAs, and the kit comprises primers for quantitative detection of the 4 miRNAs by fluorescent quantitative PCR. The diagnosis of KD can be performed only by quantificationally detecting the contents of the 4 miRNAs in serum exosomes and then analyzing the Ct values of the 4 miRNAs. The present invention possesses the advantages of easily-obtained sample, simple operation, high specificity, time saving, accurate and reliable detection result, etc., so children with KD can be timely and accurately diagnosed. Particularly, KD can be easily distinguished from common virus infection with similar symptoms only by one test. The present invention may play an important role in rapid diagnosis of KD of children and further provide a direction for developing rapid diagnostic kit of KD.