People often hide their true thoughts and feelings at work. This will not only cause great psychological pressure to people, but also bring direct or indirect economic losses to enterprises. Management scholars have gradually begun to pay attention to this problem in recent years. Because the essential connotation of sincerity contains the orientation of social relations, its social effect is more prominent in interpersonal interaction in the workplace. Therefore, this book analyses how sincerity in the workplace affects social relations from the perspective of interpersonal interaction. On the one hand, this book can help people realise how to express sincerity in the workplace, on the other hand, it can also provide useful guidance for enterprises to create a sincere atmosphere.