Magnetic resonance imaging is a new imaging technology based on the resonance characteristics of biological magnetic nuclei in magnetic field, in which relaxation time is an important physical quantity to realize and control imaging. In this paper, the longitudinal relaxation time  T1 and the transverse relaxation time T2 of relevant samples were measured by magnetic resonance imaging instrument. T1 and T2 weighted images were achieved by soft pulse spin echo sequences based on different relaxation times. Fat suppression was realizes by magnetic resonance imaging with reverse recovery imaging sequences.