A statistical analysis on the relationships between perception of justice in performance appraisal and organizational commitment of S&T personnel with different personal features in Zhejiang province is conducted based on a questionnaire survey. It is revealed that the individual characteristics of different S&T personnel contribute to the striking difference in their perception of justice in performance appraisal and have more correlative with affective commitment than with continuing and behavioral commitment. The study also shows that some of the individual characteristics have a cushiony effect on the relationships between perception of justice in performance appraisal and organizational commitment.