To evaluate the homogeneity of B1+ and signal intensity of the thoracolumbar spine with different arm positions. Twenty volunteers were scanned with 4-channel RF transmit coil at 3T. Three arm positions were used; arms on the bed, arm lift, and arm up position. Axial B1+ maps and sagittal T1WI were obtained individually with each arm position. Mean and SD values of FA, and CNR with arm lift and arm up position were significantly superior with arms on the bed position. Inhomogeneities of B1+ and signal intensities were improved by simply changing the arm position at 3T thoracolumbar spine imaging.