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Purpose: To compare a free-breath acquisition (FB) with one-breath-hold(BH) using 3D inversion recovery gradient echo MR pulse sequence for imaging of myocardial delayed hyperenhancement.Material and Methods: 3D enhanced images were acquired using FB and BH techniques in the 20 patients with myocardial infarction.The FB acquisition used navigator echo.The quality of myocardial imaging was assessed as “1=poor、2=fair、3=good、4= excellent”.infarct SNR (SNRinf) and infarct-viable myocardium CNR (CNRinf-myo) of the two groups were calculated,as well as infarct area.Analyzing the findings with SPSS12.0 software.Results: Findings for total myocardial contrast enhanced area agreed well between the two sequences.Tthe image quality score、SNRinf 、CNRinf-myo was 1.9±0.5、2.6±0.7,126.8±5.3、253.2±10.8,84.1±7.2、130.5±6.7,respectively.and there were significant difference between the findings.Conclusion: An FB navigator echo acquisition can be effectived used in the myocardial delayed hyperenhancement imaging.Image quality and spatial resolution are superior to that of BH imaging.