Objective To explore the best single energy spectrum CT diagram of application value to improve the quality of lower extremity artery angiography. Methods 72 cases of lower extremity arteriosclerosis of the study in our hospital from March 2014 to March 2017 were occlusive disease (LEAOD) patients as the research object, using the digital method is divided into experimental group and control group. 36 patients in each group, the experimental group were treated with CT750HD scanning spectrum gem produced by the GE company and the control group were treated by 64 slice spiral CT scan, the image of the two groups were compared in the iliac artery, superficial femoral artery, popliteal artery and anterior tibial artery middle plane acoustic noise ratio value BN and CNR. Results The total iliac artery of patients in the experimental group in the image, the superficial femoral artery, popliteal artery and anterior tibial artery middle plane acoustic noise ratio value BN and CNR compared with the control group, the differences were statistically significant (P<0.05). Conclusion In limb angiography imaging, the best single energy map of gem spectrum CT can display more clearly the stenosis segment vessels, the distal small vessels and the ability to harden artifact, and should be actively promoted in clinical practice