Dictation and written picture naming are the two most commonly used written product tasks, the former relies more on phonetic information, and the latter relies more on semantic information. In Chinese character production, there is still a great controversy about the ways in which orthographic representations are connected with their pronunciations and meanings. This study uses the picture(sound)-word interference paradigm, through two experiments, to investigate the interference effect of radicals in word production and the influence of radical positions on this effect. In Experiment 1, in the written-picture naming task, prominent radical interference effects were obtained, which was not affected by radical positions; while in the dictation task, radical interference effects failed to be significant. In Experiment 2, the sound-word interference paradigm was modified by stressing the importance of the interference words. An obvious radical interference effect was found only in the same-position condition, but not in the differentposition condition. These results show that there are differences in the representation units of Chinese character activated by phonological and semantic information, suggesting that Chinese character orthography may be a complex multi-level representation system.