This study was conducted to assess the changes in the functional levels of affected upper extremities after treating hemiplegic patients by applying constraint-induced movement therapy(CIMT). The subjects were selected from 20 hemiplegic patients with scores of 25 or more in Mini Mental State Examination(MMSE-k), transferred to the departments of physical therapy in two university hospitals in Busan from December, 2001 to march, 2002, and were divided into two groups. Eleven subjects with fixing unaffected arms by CIMT were assigned to the experimental patient group and the other 9 patients to control group without fixing unaffected arms. The function of upper arms for both groups were evaluated by using Actual Amount of Use Test(AAUT) and Motor Active Log(MAL) before and after physical therapy. The malts were as follows: The recovery rates of upper extremity by AOU(Activity of Use) and QOM(Quality of Movement) were 23.9% and 27.3% for CIMT treated group, and by 8.3% and 4.6% for the control group on the average, respectively, in AAUT after physical therapy, showing statistically significant differences between two groups. And in MAL, the average recovery rates were 27.3% by AOU and 22.6% by QOM for CIMT treated group while 3.1% by both AOU and QOM for the control group, and were significantly different between twogroups.