The patient after passing the screening, with the ratio of 1:1, were randomly assigned to experimental group or control group. Experimental group: on the basis of Conventional Therapy,Xiyanping injection(andrographolide sulfonate) 10-20ml/d, With 0.9% normal saline 100ml-250ml diluted intravenous drip (not with other drugs in the same container mixed use), control drip speed per minute of 30-40 drops. control group: on the basis of Conventional Therapy,Xiyanping injection simulation(0.9% normal saline) 10-20ml/d, The treatment method is the same as the experimental group.