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Objective To observe the motor cortex activitie s on fMR imaging. Method The fMR study of motor cortex was performed in 15rn normal volunteers using 1. 5T superconducting MR system, EPI pulse sequences, and BOLD fMR imaging. Six axial slices centered approxi-rn matdy at the precentral gyrus was obtained wit h or without both hands finger tapping motion under the operator instruction during the scanning.rn Pixels with significant signal differences ( P ＜0.0001) between with and without finger tapping were calculated as functional signal. Thernfunctional signal was superimposed on the corresponding T1 WI and brain water images Results The motor cortex ac tivities stimulated by fingerrn tapping show as the area of increased signalintensity. The location of actwities is correspondent very well with the location of motor cortex. Mostrn of activities present at the lateral aspect of precentral gyrus. In our group, the motion activities of left hemisphere is larger than that of right sidern in 10 volunteers, almost same sixe in 3 volunteers, smaller than that of right side in 1 volunteer. The fMR scan failed in 1 volunteer. Super-rnimposing the functional signals on the brain uner image may help to display the location of the activities. Conlusion fMR can show thern location and size of motor cortex. It is simple, fast, noninvasive, and very convenient to implements with routine MR study.