Few studies have explored the complex relationships between different measures of spoken lexical complexity and their influ-encing factors from a multiple perspective.This study categorizes lexical complexity into lexical diversity,lexical density,and lexical sophistication,examining the impact of task type(story retelling and monologue)and English proficiency(low,middle,and high)on lexical complexity in EFL learners'spoken language.A total of 169 intermediate-level English major learners participated in this stud-y.Robust multivariate repeated-measures analysis revealed main effects of both task type and English proficiency on lexical complexi-ty,though no interaction effect was found.Task type affected each measure of lexical complexity,while proficiency effects were ob-served primarily in lexical sophistication,where the high-proficiency learners outperformed those in the low and middle-proficiency groups.Robust correlation testing indicated that the relationship between lexical density and lexical sophistication varied significantly by task in the low and middle-proficiency groups.Only in the retelling task did proficiency levels partially impact the relationship be-tween lexical sophistication and the other two measures.These findings highlight the variability in lexical use among intermediate-level EFL learners and the role of task design in spoken language teaching.
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