【Abstract】 Resting state functional magnetic resonance imaging (fMRI) (resting state  functional magnetic resonance imaging, rs  fMRI) is a function of resting state network based study of functional magnetic resonance imaging (mri) technology. It is more simple than task fMRI. This article would analyze the rs  fMRI imaging principle, method and its application in insomnia and provide basis for the technology in the study of insomnia.