目的：构建有机磷膳食累积暴露概率评估模型，了解我国居民膳食有机磷累积暴露水平与暴露来源的食物贡献度。方法：利用2002年中国居民营养与健康状况调查的膳食消费量数据与2001年~2006年全国14个省/地区食品污染物监测网的有机磷农药监测数据，构建我国有机磷膳食累积暴露概率评估模型。结果：以甲胺磷为指示化学物，全人群、18岁及以上成人和2~6岁儿童有机磷累积暴露量的均数分别占有机磷急性暴露参考剂量（ARfD）的6.81%、5.92%、12.48%；其累积暴露量P99.9分别为ARfD的2.39倍、2.06倍、5.05倍；人群超标率分别为0.37%、0.25%、0.88%。贡献度较大的食物主要是青菜、大白菜、豇豆、茄子，累积贡献度达40.38%~41.35%；不同特征人群食物贡献度不尽相同，苹果（5.48%）和马铃薯（2.04%）对儿童贡献度较成人和全人群大。结论：我国居民膳食有机磷累积暴露分布人群变异较大，2~6岁儿童与高端暴露人群累积摄入过高应予重视；对青菜、大白菜、豇豆、茄子的有机磷残留状况应加强监管。本研究可为了解我国居民膳食有机磷累积暴露水平与暴露来源的食物贡献度、开展有机磷农药对环境污染的防治工作和食品安全风险管理工作提供科学依据。

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