Objective:To identify which level of language processing is impaired in an optic aphasic patient with pure alexia.Method:Psycholinguistic assessment in Chinese aphasia(PACA) and other related tests were used to assess an optic aphasia with pare alexia patient’s language impairment.Result:①The patient’s basic visual perception and structure representation by object-picture matching with different view points was normal.②Accessing to semantic system from visual imports was impaired,showing difficulty in visual picture naming and visual picture-picture correlation tasks.③Conversion from visual word form into its phonologic representation was impaired,showing difficulty in word loud reading.④Mapping from visual word form to semantic system was more disrupted than that from sounds to semantic system,indicating visual word-picture matching was more difficult than auditory word-picture matching.Conclusion:The main language processing impairment in this optic aphasic patient was failure to access from visual import information(object) to detailed semantics and from visual word form to semantic and to phonological representation.