以１９９４年８～１０月在云南省陇川县１８～２９岁男性青年断面调查中发现的静脉吸毒者为研究对象，运用回顾性队列研究设计，观察期为１９９１年１月１日至１９９４年８月１日，采用单因素及多因素分析方法，研究了静脉吸毒者共用注射器具行为的决定因素。在回顾性队列研究期间，静脉吸毒者中共用注射器具的年新发生率平均为１９．６％。多因素分析结果显示，除民族以外的其它人口学特征、吸烟、饮酒及婚前（婚外）性行为，对静脉吸毒者中共用注射器具的发生无预测作用，而景颇民族则是合用注射器具的主要危险因素（ＯＲ＝５．８，９５％Ｃ．Ｉ．２．５～１３．８），其人群归因危险度为５８．５％。我们认为，对于景颇族静脉吸毒者中很高的合用注射器具行为需要进一步研究。针对合用注射器具行为的ＨＩＶ预防性干预工作，应以景颇族静脉吸毒者为主要目标人群 Taking the intravenous drug users who were found in the survey of young men aged 18-29 in Longchuan County of Yunnan Province from August to October 1994 as study subjects, the retrospective cohort study design was used. The observation period was from January 1, 1991 to 1994 August 1, using single factor and multivariate analysis, the study of intravenous drug users shared injection apparatus behavior determinants. During the retrospective cohort study, the annualized rate of sharing of injecting devices among intravenous drug users averaged 19.6%. Multivariate analysis showed that demographic characteristics, smoking, alcohol consumption and premarital (extramarital) sexual behaviors other than ethnic groups had no predictive effect on the sharing of injecting devices among intravenous drug users, while the Jingpo ethnic group was a combination of syringes The main risk factors (OR = 5.8,95% C.I.2.5 ~ 13.8), the risk attributable to the population was 58.5%. We think that further research is needed on the high combination of injecting devices among Jingpo drug users. HIV prevention interventions targeting shared syringes should be targeted mainly at Jingpo intravenous drug users