Preparation of ceftazidime skin test solution is divided into four steps: 1. Take 1.5g of ceftazidime and dissolve it in 0.9% saline to 6ml, since the solution is called skin test solution A. 2. Take 0.1ml of skin test solution A and add 0.9% saline to dilute it to 1ml, this solution is called solution B. 3. Take 0.1ml of solution B and add 0.9% saline to dilute it to 1ml, this solution is called solution C. 4. This solution is called solution C. 4. Take 0.2ml of solution C and add 0.9% saline to dilute to 1ml, this solution is called solution D. When skin test, take 0.1ml of solution D for determination, this solution D is the skin test solution of ceftazidime, the configuration principle is cephalosporin, the concentration of skin test solution is 500ug per ml.