Objective      To study the effect of different emotional backgrounds induced by sound clips on source memory. Methods      In this study

we used multi-key paradigm of source memory test

with a 2-factor (3×4) fractional design

to measure the subjects’ reaction time and accuracy of source memory in different emotional background. The differences among different backgrounds/stimulations were statistically analyzed.  Results       Under 3 emotional backgrounds

reaction time and accuracy rate of the subjects responding to both correct and false sources differed significantly from those underwent new stimulus（P0.01）. The reaction time and accuracy rate were also significantly different between the positive and negative backgrounds（P0.01）but not the emotional effect（P0.05）. Conclusion      Under different emotional contexts induced by sound clips

source memory is more complicated and time-consuming than item memory even under the same stimulation. Moreover

the reaction time is prolonged when the source can not be extracted or the extraction is uncertain.