Objective To study the influences of physiology, psychology and neurolinguisticson Han language.Methods (1)Aphasia tests were perfumed for 1 670 stroke patients of unilingual Han nationality.(2)Hearing writing tests were performed for 135 healthy adults.(3)Comparison the aphasia incidences in stroke patients of different districts and different literate level groups.(4)Follow up study of aphasics intend to find their outcomes.Results (1)In our studies, the total aphasia incidence, the aphasia incidences after left and right hemisphere damage in dextrals, the aphasia types and other relevant symtoms of stroke patients were different from that in most western literarure.(2)In the results of hearing writing tests,there were more mistakes of single characters in hearing than two character words.Two character words vs,four character compound words or phrases were in a similar manner.(3)The aphasia incidences in the groups of higher literate level were lower than that in group of lower level.This result was also different from that in the Occidentals.(4)The outcomes of our aphasics were favorable than that reported in western literature.Conclusion The causes of difference between chinese and western people in language disorders after brain disease were due to the nature of language,ideograph and phonograph.The function of ideograph of Chinese is not only confined in the left but also in the right or rather diffusible in both hemispheres.On comprehension of ideographic language by Chinese might not be depended on the sound of the character or word.The unit of perception,code and memory might be on the levels of conception or proposition.