通过对不同情绪唤醒状态下的心率变异性（HRV）和呼吸性窦性心率不齐（RSA）分析，探讨了积极情绪加速高唤醒消极情绪引起的心血管反应向基线恢复的自主神经活动机制。实验表明：与在观看高唤醒恐惧影片结束后观看悲伤影片和中性视频比较，观看高唤醒恐惧影片结束后观看快乐影片加速了高唤醒恐惧影片引起的心率、指脉等心血管反应向基线的恢复；与在观看高唤醒恐惧影片结束后观看悲伤视频和中性视频材料比较，观看高唤醒恐惧影片结束观看快乐影片后的恢复期，被试的迷走神经激活水平迅速增强，迷走神经激活水平甚至超过基线期。因此，积极情绪加速高唤醒消极情绪刺激引起的心血管反应向基线恢复，其自主神经活动机制是在积极情绪状态下个体有更强的迷走神经激活。

The results of existing studies showed that positive emotions sped from the cardiovascular aftereffects of negative emotions. But the existing studies provided evidences not enough for this recovery effects. Especially, what is the mechanism of autonomic nervous activity for the recovery effects? Few studdies focused on it. So this study aims to reexamine the effects that positive emotions speed from the cardiovascular sequelae of negative emotions and explore the mechanism of the autonomic nervous acitivity underlying it. In the experiment, after 180 seconds baseline period, participants were asked to view an emotionally evocative film that induced fear, immediately following fear arousal, participants were randomly assigned to view an emotionally evocative videoes that induced amusement, sadness, or neutrality for 120 seconds, then kept relaxing state for 120 seconds. 96 participants recruited from college students attended the experiment. The results of experiment indicated that: compared to participants who viewed the neutral and sad secondary videoes, those who viewed the positive film exhibited more rapid returns to pre-film levels of cardiovascular activation. Moreover, compared to participants who viewed the neutral and sad secondary videoes, those who viewed the positive film exhibited stronger vagal activation in recovery periods. Positve emotion sped recovery from cardiovascular response of negative emotions, and the mechanism of the autonomic nervous acitivity underlying it was that stronger vagal activation was generated in the state of positive emotion.