Abstract: Objective: To explore the effect of Psychological Reward Satisfaction on positivity ratio among nurses.Methods: Totally 566 nurses were recruited and interviewed by the Chinese version of Psychological Reward Satisfaction Scale and the Positive and Negative Affect Scale. Results: The psychological reward satisfaction from the head nurses (14.53±2.09) was significantly higher than that from the doctor (13.12±1.89) (P<0.01). The scores of positive affect, negative affect and the positivity ratio were (24.96±5.43), (23.35±6.69), and (1.25±0.46), respectively. The score of Psychological Reward Satisfaction was positively correlated to the positive affect and the positivity ratio (P<0.05), and negatively correlated to the negative affect (P<0.05).Hierarchical regression analysis showed that the employment style, position titles and the Psychological Reward Satisfaction were predictors of positivity ratio among nurses. Conclusions: The Psychological Reward Satisfaction and the positivity ratio were in the low level among nurses. We should improve the positivity ratio among nurses by enhancing their Psychological Reward Satisfaction.