Background: Overtime work is a common phenomenon worldwide, the consequences of overtime work cannot be overlooked. Severe overtime work has led to some physical and psychological problems among workers. The seriousness of overtime work in China'sconstruction industry is not negligible. Therefore, this study takes young designers in China'sconstruction industry as the research object. Young designers may encounter more challenges and inequalities in their work process. The recent graduates who face even more severe overtime conditions. This study focuses on the association between overtime and job satisfaction. And to identify the working overtime reason of who has well-trained skill with intrinsic and extrinsic working motivations. Purpose: This study is a survey of young designers in the Chinese architecture industry through interviews to establish the reasons for overtime and the factors affecting job satisfaction for well-trained, intrinsically and extrinsically motivated new employees, analyze the link between overtime and job satisfaction. Methods: We research through a qualitative research method. Data are collected from using semi-structured interviews. The data are categorized and analyzed to gain insight into the causes and effects of overtime work. Conclusion: After research and analyze, we found that there are four main categories of reasons for young designers to work overtime. The reasons are internal to the construction industry, company management, company work atmosphere, and personal motivation to work overtime. For young designers, the intrinsic motivation is sufficient. They are not concerned about overtime, and a short period of active overtime does not reduce their job satisfaction. But when external reasons force them to work overtime for a long time. Their job satisfaction decreases. In this regard, there is no better way to improve the impact on job satisfaction than to reduce working hours.