Objective To investigate the enhancement scanning technique of nuclear magnetic resonance perfusion (MRPP) with enhanced magnetic resonance pulmonary angiography (MRPA) for the diagnosis of pulmonary embolism in patients with sensitivity and specificity differences, compare the clinical value of diagnosis. Methods to analyse the clinical data in our hospital from 2010 December to 2013 June period of 32 patients with pulmonary embolism patients. On the enhanced magnetic resonance perfusion scanning and enhanced magnetic resonance pulmonary artery angiography, including 10 patients who underwent simultaneous radionuclide lung perfusion scan, and another 7 patients after thrombolytic therapy, MRPP and MRPA review of the. When the examination is arranged in the abnormal regions of patients, as well as the upper middle and lower lung artery lesion area of region of interest (ROI), the signal time curves, signal strength (SI) measurements were carried out, thus obtaining the blood perfusion changes of peak signal intensity ratio (TROS). Results Of the 32 cases of pulmonary embolism were examined by MRPA, found a total of 137 pulmonary artery occlusion, after MRPP found a total of 125 pulmonary blood flow perfusion abnormality of regional and MRPA results agree, agreement rate was 91.24%. 32 cases of pulmonary embolism in the MRPP examination found that arterial embolization of pulmonary artery segment with 57 subsegments and segment. 10 patients also underwent radionuclide lung perfusion scan results showed that a total of 81 patients, a pulmonary segmental perfusion defects, while MRPA showed 77 lung segments are involved, the sensitivity was 95.06%, MRPP showed 73 segmental involvement, the sensitivity is 90.12%. Conclusion MRPP for the diagnosis of pulmonary sensitivity was significantly lower than that of MRPA, MRPP and MRPA have can effectively observe the difference of pulmonary embolism of low perfusion and perfusion defect region.