Abstract: Objective To know the job performance of nurses and to analyze the influence of perceived social support on job performance and the mediating role of work values. Methods A questionnaire survey was conducted among 989 clinical nurses with the job performance scale,the work value scale,and the perceived social support scale. Results The mean score of job performance was（4.09±0.28）. The mediating effect test showed that work values played a mediating role partly between perceived social support and job performance（0.110）,accounting for 32.2% of the total effects. Conclusion The job performance is on the middle level,but it still needs to be improved. Nursing managers should cultivate the positive values of nursing workers,enhance nurses' subjective feelings of the social support system,and further improve their job performance.

Key words: Nurses, Social Support, Questionnaires, Work values, Job performance