Background: The purpose of this study is on finding the effects of the lumbar stabilization exercise applied with the proprioceptive neuromuscular facilitation technique (PNF) to the balance and the gait of chronic stroke patients. Methods: An experiment was conducted using two sets of behavioral measures with 30 chronic stroke hospitalized patients in the rehabilitation center located in Incheon city. The 15 participants in group A were instructed to apply the traditional exercise therapy. And the other 15 participants were assigned to apply the lumbar stabilization exercise with the PNF technique. It was conducted for 30 minutes per three days for six weeks, which had eighteen times. Using the balance system, it was checked about the static and dynamic balance. Using the Gaitrite, it was checked about the ability of the gait. Results: There was a better effect on both groups especially with the static balance. Those who were applied the lumbar stabilization exercise with the PNF technique had a better result on the dynamic balance and the gait than those applied the traditional exercise therapy. Conclusion: This research shows that the Lumbar Stabilization Exercise applied with the PNF technique is more effective on dynamic balance and the gait performance ability of the chronic stroke patients.