Objective The purpose of this paper is to explore effect of the ECG-gating technology of liver DWI effects can overcome heart throb. Methods Select volunteers,41 cases were unable to control and switch control liver DWI examination,can the heart switch control group as the experimental group,unable to control group to the control group, s/b value selection of 0 and 500 mm squared,adopt different triggering time delay trigger scanning respectively. First liver DWI scans for 10 points and 19 points,can collect two ADC values,measured by two measurement,measurement is 1 after measuring the data for the first time, interval of 15 days and then to the second measurement, summarizes the analysis of ADC values, draw the conclusion. Results The control group of the left hepatic lobe ADC values were significantly higher than those of the right liver lobe. The experimental group of the left hepatic lobe ADC values significantly below the right liver lobe. Bland-Altman analysis shows that this method can repeat rate is high. When trigger delay time of 500 ms, can repeat rate is high. Conclusion Heart switch keying technology can effectively reduce the ADC values,improve the quality of liver DWI scans can, high repeatability, best to trigger in the 500 ms.The heart switch control technology to overcome heart beat effect is more ideal, suitable for promotion use.