目的　分析住院病人费用的影响因素及其综合影响力 ,以控制医疗费用的不合理增长。方法　以 1所三甲医院 1997年住院构成前 10位病种的费用资料为样本 ,采用神经网络模型对出院病例的医疗费用进行统计学分析。结果　住院天数、入院情况、年龄及术前天数是影响住院费用的主要因素 ,其综合影响力分别为 0 4 879、0 2 12 4、0 184 7和 0 0 6 12。结论　控制医疗费用的不合理增长应该着力于降低药费 ,缩短住院天数和术前天数 Objective To analyze the influencing factors and influential factors of inpatient expenses so as to control the unreasonable increase of medical expenses. Methods The cost data of the top 10 diseases in a hospital in the top three hospitals in 1997 were taken as samples, and a statistical analysis of the medical expenses of discharged cases was conducted using a neural network model. Results The length of hospitalization, hospital admission, age, and number of days before surgery were the main factors affecting hospitalization costs. Their comprehensive influence was 0 4 879, 0 2 12 4, 0 184 7 and 0 0 6 12. Conclusion Controlling the unreasonable growth of medical expenses should focus on reducing drug costs, shortening hospitalization days and preoperative days