Results: Children f with normal body temperature accounted for 38.3%; low blood pressure accounted for 81.7%; coma accounted for 51.7%; decreased white blood cells accounted for 28.3%; thrombocytopenia accounted for 36.7%; pH value decreased by 43.8%; BE≤-5 is 88.3%; PaO2/FiO2≤300 is 50%; positive blood culture result is 25%; the result of treatment is 51.7%; among deaths, patients who died <24 hours were 34.5%; thrombocytopenia patients have a higher mortality risk 3.67 times compared with thrombocytosis or normal platelets patients, p<0.05.