The purpose of this study was to evaluate the effect of pelvic tilt exercise on the characteristics of gait in the patients with hemiplegia. One session of pelvic tilt exercise in lower trunk initiated pattern for 20 minutes was administered to 21 hemiplegic patients in one general hospital in Daejeon. Characteristics of gait such as velocity, cadence, base of support, stride length, step length and foot angle were measured before, immediately and 30 minutes after exercise in each patient. Ink foot print method was used and the specially designed clock to measure the time spent for walking 10 meters. The data were analyzed repeated measures ANOVA. The following results were obtained. 1. Gait velocity was significantly increased immediately after pelvic tilt exercise (29.88 m/sec) compared to that of preexercise (26.46 m/sec) and significantly increased 30 minutes after exercise (31.79 m/sec) from the level of immediate postexercise. 2. Cadence was significantly increased immediately (78.87 steps/min) and 30minutes postexercise (79.91 steps/min) compared to that of preexercise (74.72 steps/min). 3. Base of support was significantly narrowed immediately (13.26 cm) and 30minutes post exercise (13.24 cm) compared to that of preexercise (13.98 cm). 4. Stride length was significantly increased immediately in unaffected side (73.39 cm) and in hemiplegic side (76.06 cm) and 30 minutes postexercise in un-affected side (76.06 cm) and in hemiplegic side (78.84 cm) compared to that of preexercise in unaffected side (67.90cm) and in hemiplegic side (70.55 cm). 5. Step length was significantly increased immediately in unaffected side (36.81 cm) and in hemiplegic side (37.94 cm) and 30minutes postexercise in unaffected side (37.77 cm) and in hemiplegic side (39.29 cm) compared to that of pre-exercise in un-affected side (33.76 cm) and in hemiplegic side (35.10 cm). 6. Foot angle of affected side was significantly decreased immediately (12.13 °) and 30 minutes postexercise (12.65 °) compared to that of preexercise (14.12 °) but foot angle was increased in the unaffected side without statistical significance. It could be concluded that pelvic tilt exercise might be a effective addition in the treatment program to improve gait pattern in patients with hemiplegia.