語文能力測驗的某些試題，會否因涉及一些與性別有關的活動對男或女生不利？例如女生不熟悉冰球，如出現與冰球有關的詞彙，即使與男生能力相同也表現較差。本研究運用兩種方法（SIBTEST與IRT-LR方法）檢查一個實際的漢語詞彙測驗的39個項目，看是否有這種性別上的差異（項目功能差異，DIF）。在兩個初三團體（共1608人）的男女生比較分析中，發現39個詞彙中有七個屬一致性DIF的項目，兩個有非一致性DIF傾向的項目。在α=.05水平下，兩個樣本的性差DIF的一致性百分比達74%（SIBTEST法）和87%(IRT-LR法)。同一樣本內兩種方法探測結果的一致性百分比均為90%。本文還討論了影響DIF項目的一些可能性，以及如何在項目分析中處理這些項目的方法。

　　　　　In a language achievement test, are there items disadvantageous to male or female students because their content contains sex difference related activities? For example, female students do not like ice-hockey and despite their similar ability to males, females may still perform much worse. In the present study, we used two methods (SIBTEST and IRT-LR) to examine whether any of the 39 items in an actual Chinese vocabulary test showed this kind of sex difference (sex differential item functioning, DIF). In two groups of Junior Secondary Three (N=1608) students, it was found that seven items were of uniform DIF type (different difficulty only), while two showed non-uniform DIF (different discrimination and difficulty). The percentage of agreement between the two groups of students were 74% and 87% (α=.05) in SIBTEST and IRT-LR methods respectively. The percentage of agreement of the two methods with the same subjects was reasonably high 90% (α=.05). The possible reasons leading to DIF and ways of handling these items in the Chinese vocabulary test were also discussed.