Objectives : The aim of this study was to analyze the effect of physical therapy and related factors on cognitive function in stroke patients. Methods : Questionnaires were completed by 36 stroke patients at physical therapy room in Dongeui Medical Center from September 1999 to September 2000. The Mini-Mental State Examination-Korea(MMSR-K) was used to assess the differences for cognitive function in patients who had suffered a stroke. Results: There were severe $16.7\%$, mild $16.6\%$, and normal $66.7\%$ in distributions for cognitive function. respectively. In the difference of cognitive function score for at initial, 25.64 for smokers had significantly higher than 20.36 for nonsmokers(p<0.05). Also, 26.21 for smokers had higher than 21.27 for nonsmokers alter a month(p<0.05). However, no significant difference existed in comparison at initial with after a month. 25.0 for patients without coma was higher than 9.50 for with(p<0.05), 25.80 for patients without was also higher than 10.16 for with in after a month. There were no statistically significant variables related to difference for cognitive performance in multiple regression analysis. conclusions: Results indicated that smoker and patients without coma at onset had high cognitive functions.