The trace arsenic in wheat was determined by ICP-AES with a flow injection system involving hydride generation. The orthogonal design was used to optimize apparatus operating parameters that have great influences on the determination and the conditions of hydrides formed. 流动注射-氢化物发生-ICP-AES检测小麦粉样品中痕量的砷,正交设计试验找出仪器测定的最佳工作条件,并对影响测定的主要参数和砷的氢化物产生条件进行了研究。