按随机原则将95例新生儿重症肺炎病例分为IVIG治疗组和常规治疗组，发现IVIG在改善症状、消除肺部体征、缩短住院时间和提高治意率等方面均优于常规治疗。使用IVIG后血清IgG水平提高59．46％，而IgA、IgM无明显改变，补体C3水平明显降低，对细胞和T4／T8比例稍降低，但差异无显著性意义。 95 cases of neonatal severe pneumonia were randomly divided into IVIG treatment group and conventional treatment group according to the principle of randomization. IVIG was found to be superior to conventional treatment in improving symptoms, eliminating signs of lung, shortening hospital stay and improving the rate of treatment. Serum IgG levels increased by 59.46% after IVIG treatment, while IgA and IgM had no significant changes. The level of complement C3 was significantly decreased, while the ratio of cells to T4 / T8 was slightly decreased, but the difference was not significant.