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This study was conducted to compare the effectiveness between lumbar stabilization exercise and lumbar strengthening exercise programs in increasing pain intensity and lumbar function in patients with lumbar degenerative disk disease. Forty patients diagnosed as having a lumbar degenerative disk disease participated in an 8-week exercise program and were randomly divided into spinal stabilization and lumbar strengthening exercise groups. Pain intensity and lumbar disability were measured before and after each exercise program by using a visual analog scale (VAS) and Oswestry disability index. Paraspinal lumbar muscular strength in four directions was evaluated by using Centaur. After 8 weeks of each exercise intervention, VAS score, ODI, and lumbar muscular strength significantly decreased in both groups (p<.05). In comparing VAS score, ODI, and lumbar muscular strength between the 2 groups, more-significant decreases were observed in the lumbar stabilization exercise group than in the lumbar strengthening exercise group (p<.05). In recommendation, the data from this research are useful for developing a more effective rehabilitation program for patients with lumbar degenerative disk disease. Furthermore, more studies can be conducted in the rehabilitation of patients with lumbar degenerative disk disease.