Abstract:Trade unions play an important role in representing employees and safeguarding their rights and interests. However, pereeptionsof different groups about this may vary in different contexts. The study explores whether employees with unfair pereeptions have a higherpositive pereeption of union functions. The research results show that after controlling demographie characteristies and individual employmentcharacteristics, social unfaimess does not have a significant impact on employees' cognition of trade union funetions, while general workplaceunfairness does not significantly affect employees' cognition of trade union funetions. Only a serious sense of workplace injustice can significantlyincrease employees' positive pereeption of union functions. This result indicates that there are complex differences between different groups in therecognition of China's trade union functions.