Objectives : The aim of the study is to investigate the characteristics of Ryodoraku score accoding to Sasang constitution in the low back pain patients. Methods : For Roydoraku score examination, we made a comparison between 44 patients who were diagnosticated to low back pain(LBP group) and 35 persons who were not(non-LBP group). 1. We campared the variation from physiologic range of 12 Roydoraku points between LBP and non-LBP group. 2. We campared the variation from physiologic range of 12 Roydoraku points according to Sasang constitution between LBP and non-LBP group. 3. We campared the variation from physiologic range of 12 Roydoraku points according to Sasang constitution in LBP and non-LBP group. Results : 1. The score of H2 H5 F5 had statistical differences. 2. The score of H3 H5 F5 had statistical differences in Soeumin. 3. The score of H3 F4 had statistical differences in LBP gorup. Conclusions : These results suggest that roydoraku maybe used to evaluate low back pain patients.