The study investigates: (1) how different idiom types, classified on the basis of a cross-linguistic comparison of Chinese and English idioms in terms of conceptual basis, affect English idiom comprehension as revealed from both the general performance and the on-line processing strategies adopted by Chinese EFL learners at different proficiency levels, and (2) to what extent can the observed learner behavior be accounted for within the theoretical framework of idiom comprehension. The study has provided empirical evidence for the configuration hypothesis of idiom comprehension.