Objective:To evaluate the application of adaptive sequence scanning techniqueology dual-source CT(DSCT) in the low-dose computer tomography coronary angiography (CTCA). Methods:Two hundred and eight-five patients suspected of coronary artery disease with heart rate > 70 bpm and regular rhythm were randomly assigned into experimental study group (145 cases) and control group(140 cases). Study group were checked with adaptive sequence scanning technique,and control group with retrospective ECG-gated spiral scanning. There were 33 cases in study group and 32 cases in control group undergoing conventional coronary angiography(CCA) within 2 weeks. The coronary artery evaluation rate of CTCA between two groups were compared using -字2 test. The imaging quality of coronary artery and radiation dose of two groups were compared using t test,the consistency of coronary artery stenosis in CTCA and in CCA were evaluated with the Kappa test. Results:The evaluation rate of coronary artery in the study and control group were 98.4%(1 787/1 816) and 98.1%(1 717/1 750),respectively. The image quality scores of two groups were(4.42 ± 0.64) and(4.41 ± 0.65) respectively,and there was no statistical difference in scores of imaging quality between the two groups (t = 0.38,P = 0.710). The consistency of CTCA and CCA in diagnosing coronary artery stenosis of two groups were 0.829 and 0.845 by Kappa test,respectively. The average effective radiation doses of study group and control group were (4.60 ± 0.98) and (12.60 ± 1.90) mSv,and there were significant differences between two groups (t = 44.89,P = 0.000). Conclusion:Using DSCT adaptive sequence scanning technique in CT coronary angiography to check the patients with heart rate > 70 bpm and regular rhythm can ensure good image quality and high diagnostic accuracy of coronary artery stenosis,and also significantly reduce the radiation dose.