The imaginary hot stimuli and Real hot Studied by fMRI. The similarity and difference of the brain's excitation have been found. The brain's area SI, left superior frontal gyrus, left middle frontal gyrus, motor area of cerebrum and cingulate gyrus have been excited by imaginary hot stimuli. And the brain's area SI, right superior frontal gyrus, right middle frontal gyrus and motor area o cerebrum have been exctited by real hot stimuli. The excitation of frontal lobe and cingulate gyrus are different between the two situations. These results are almost the same as the excitation by imaginary and real cold stimuli except the excitation of the frontal lobe.