Time perception has been shown to be influenced by the attentional guidance from working memory(WM),with that the stimulus matching the working memory content was judged to last longer than mismatching stimulus.However,the guidance effect might be flexible and modulated by other factors.In this study,we combined change detection task paradigm and time comparison task to exam the influence of ISI(the stimulusinterval between the offset of WM content and the onset of target duration)and target duration on time judgment.