This abstract investigated the method for quantitatively predicting B0 variation induced by human body. Magnetic field simulation was performed, with human phantom positioned in different strength’s B0 fields, and revealed the linear relationship between patient-induced B0 inhomogeneity and the background B0 field. The linear relationship was proved in clinical experiment, which used the relationship to predict B0 field map and compared the predicted B0 field map with the real B0 field map. The clinical experiment shows that 95% voxels has a prediction accuracy within 50Hz. The finding could further benefit image quality and improve scan workflow.