The integrated PET/MR combines the advantages of functional imaging device PET and high resolution high contrast MRI, simultaneously acquiring PET and MR images at the same position, improving image fusion accuracy. However, respiratory motion during abdominal imaging causes notorious motion artifact in the MRI images and blurring the PET images. A PET/MR motion correction method based on real-time 2D excitation navigator has been implemented and evaluated. Phantom and human imaging result implies that this technique can precisely acquire object motion and effectively eliminate motion blurring. Without additional operation and device, it offers a simple and cost-down way for clinical use.