Yi language in Northwestern Guizhou Province is an id-eograph with the wording rules of hieroglyph, self-explanation, association, pictophmetic character-formation, mutually explana-tion and borrowing, which are the same as those of Chinese char-acters. But the character patterns are complicated in Yi language with a lot of single characters and less compound characters, and besides, there is no fixed character component expressing"cate-gories of meaning"and defining radicals, so the study of Yi lan-guage cannot be based on theories of Chinese characters, but on the rules of character formation in Yi language. The arrangement of the radical system of Yi language is an important fundamental work, as it is of great theoretical and practical significance to the compilation of Yi language works and implementation of informa-tion-based Yi language.%黔西北彝文也是表意文字，和汉字一样，也有象形、指事、会意、形声造字法和转注、假借的用字规律。但其文字字形复杂，独体字多，合体字少，又没有固定表示“义类”的偏旁，确定彝文部首，不能按汉字学的理论，要遵循彝文造字的规律来遴选和甄别。整理彝文部首系统，是一项重要的基础性工作，对于编纂彝文子书、实施彝文信息化具有重要的理论和实践意义。
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