The purpose of this study was to identify the effects of selective intensive Whole-body electromyostimulation(WB-EMS) training on the lumbar stability, and gait function of subjects with lumbar instability. There were recruited 34 subjects with lumbar instability for this study. They were selected to have tested positive through the prone instability test and passive lumbar extension test. They were randomly divided into experimental group (n=17) with WB-EMS and control group (n=17) without WB-EMS, respectively. Both groups received a total of 45 minutes of intervention programs, respectively. Measurements were used before and after the intervention. The lumbar instability was measured by the single limb stance test and plank test. The gait function was used the gait analysis. The following statistical analysis was performed: an independent t-test for the general characteristics of the subjects, 2×2 analysis of variance with repeated measures for the lumbar instability and gait function. The group×time interaction effect showed significant improvement in the right single limb stance (F=5.445, p=.026), left single limb stance (F=4.245, p=.048) and plank test (F=4.341, p=.045) in lumbar stability test, And also, velocity (F=4.360, p=.045), cadence( F=4.681, p=.038), step time (F=5.261, p=.029) and step length (F=20.149, p=.000) of gait analysis. This study suggest that WB-EMS may be effective exercise for the lumbar stability and gait function in subjects with lumbar instability.