| As one of the personality traits, emotional stability is an important characteristic and also an indispensable part of emotion. It is a compulsory basic psychological quality for those who engage in the field of aerospace and aviation which is full of high stresses, high cognitive loads and dangers; it is the premise and qualification to fulfill the high-tech tasks under such conditions and was more and more concerned by researchers.Psychophysiological studies on emotion and emotional stability have a long history. Before heart rate variability (HRV) was born, so many physiological variables such as heart rate, respiratory, blood pressure, myoelectricity, galvanic skin response and EEG were used to study emotion. During the past three decades, as a good marker of activities of autonomic nervous system(ANS), HRV werewidely used in clinical medicine and psychophysiologjcal studies of emotion. But studies on HRV to emotional stability were rarely documented.On the basis of the past research, the aims of this study include: (1) To establish the module of emotion induced by cognitive task; (2) To set up the assessment system of criterion of emotional stability; (3) To study on the effect of emotional stability to cognitive task performance; (4) To investigate the influence of situational variable on psychophysiological research of emotion; (5) To discuss the physiological differences between different emotional stability individuals under different situations.Main results and conclusions are the follows:1 .This research successfully establishes the experimental module of emotion, the Stemberg dual task.2. This research sets up the assessment system of criterion of emotional stability.3. Individuals of high emotional stability have better performance than those of low emotional stability.4. With tension degree of situation increased, physiological variables changed: HRT,LF|,HFj,SDNNl,RMSSD|,LF/HFt,RAt,RF|,RIEt,SDIPIt,RMSSDIPlT,S DEPIT,RMSSDEPIT,ST|and MET-S.Variables of respiratory variability(SDIPI,RMSSDIPI,SDEPI, RMS- SDEPI) are good ones to reflect degree of respiratory uniformity under tension and can be used to assess emotional stability.6.Phenomenon of situational separation was found in this study which suggests that psychological activity have a certain degree of physiological reserve. Under the situation with less tension, individuals of low emotional stability beginto use the backup resource. While those of high emotional stability start to consume this reserve only under the situation with high tension.7. There are physiological differences between individuals of high emotional stability and low emotional stability. Under the situation with less tension, spectral components of HRV of individuals of high emotional stability decrease and LF/HF increase, but under the situation with more tension, HRV changes conversely and LF/HF still increase. No matter how much tension the situation has, individuals of high emotional stability have slow respiratory frequency, deep breath, uniform breath and less myoelectricity. All these changes suggest that those of low emotional stability have higher activities of sympathetic nerve system. And the findings in this study testify the relationship between emotional stability and autonomic nervous system.8. The psychological and physiological assessments of emotional stability are from different angles, but they have good consistency. At the same tune, they lay different stress on emotional stability.hi brief, this paper did a primary argument against psychophysiological study on emotional stability and it is of high scientific value. It can be applied to evaluate the emotional stability of pilots with a promising predictability. Meanwhile, this research provides a way of selecting persons who engage in the field full of high stresses, high cognitive loads and dangers. It is of theoretical value and can be applied to a certain extent.
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