Objective To study the correlation of the Loewenstein Occupational Therapy Cognitive Assessment and the Western Aphasia Battery, and to offer trusty warrant for clinical application.Methods A total of 37 patients with aphasia following brain lesions were selected.They received an evaluation by the Loewenstein Occupational Therapy Cognitive Assessment for their recognition function, and an evaluation by the Western Aphasia Battery for their language function.The association between every subentry scores, total scores on the Loewenstein Occupational Therapy Cognitive Assessment and the western aphasia battery of every subentry scores, aphasia quotient, performance quotient and cortical quotient was analyzed by using Pearson correlations analysis, partial correlations analysis, with the program SPSS 12.0.Results All 37 patients were involved in the result analysis.Correlations of total scores in LOTCA and the aphasia quotient, the performance quotient,the cortical quotient in WAB were positively significant (P＜0.01).Correlations of Visual and Spatial Perception,Thinking Operations subentry scores, total scores in LOTCA and every subentry scores in WAB were positively significant (P＜0.01 ).Correlations of Orientation, Visual Motor Organization subentry scores in LOTCA and repetition in WAB were not significant (P＞0.05 ).However, correlations of it and other items in WAB were significant (P＜0.05 ).Conclusions The relation between Language function and cognitive function was highly close correlated.The LOTCA can be clinically used to evaluate the Chinese aphasia subjects with cognitive problems after brain lesions.