Emotionality has long been recognised as a crucial ingredient in human beings. A good connection with emotionality is essential; and it is highly complicated and dynamic in human life. It can never be fully explained or analysed by rational analysis and measurement of emotions. Based on the multi-dimensional model of emotionality in terms of affect, mood, feeling and sense, the writer tries to interpret and intervene with the emotionality of severe mental illnesses such as the blunt affect of schizophrenia, feelings of anger in major depressive disorder, a dissociative sense of fear in post-traumatic stress disorder and the lonely mood in borderline personality disorder.