本研究通过考察图片命名任务中的语码切换代价，探讨小学纳西———汉双语者在双语言语产生中的词汇选择机制。结果表明：1.对于纳西语作为基本熟练，汉语作为相对熟练的不平衡双语者而言，用纳西语和汉语命名图片时，存在切换代价的不对称性，切换至相对熟练语言（汉语）的代价显著大于切换至基本熟练语言（纳西语）；2.在基本水平的实验任务中，用纳西语和汉语命名图片时，存在切换代价的不对称性；在范畴水平的实验任务中，用纳西语和汉语命名图片时，不存在切换代价的不对称性；3.任务水平影响词汇的选择机制，但语言的熟练程度并没有影响词汇的选择机制。%This paper presents a study on the lexical selection mechanism in bilingual speech produc-tion of the bilingualists of the Naxi and the Chinese languages at primary school through language switch costs in the picture naming tasks. Results of the study show:1)for unbalanced bilingualists virtually flu-ent in Naxi but only relatively fluent in Chinese,asymmetrical switching costs were observed when naming pictures in Naxi and Chinese ! it costs notably more to switch to the relatively fluent language (Chinese) than to the virtually fluent language (Naxi);2)asymmetrical switching was observed when naming pic-tures in Naxi and Chinese in the basic -level experiment while no asymmetrical switching was observed when naming pictures in Naxi and Chinese in the category-level experiment;and 3 )level of the tasks in-fluences the lexical selection mechanism but language fluency does not.
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