The aim of this research is to achieve a rough estimation of the radon diffusion coefficient from soil in Bengkulu. The samples were taken from 28 points of different area in Bengkulu. We used a GM tube and LR-115-II detectors to detect the radon concentration. It is found that the average of radon concentration is 136 Bq/m3. While, on the other hand the average of radon diffusion coefficient of soil in­crease lenearly with increase of soil depth. We also found that radon exhalation rate from ground surface is 0.88 mBq/m2/s up to 1.51 mBq/m2/s.