Psychological suzhi has increasingly been recognized to buffer chronic stress and improve mental health. However, few studies have examined the role of psychological suzhi in the response to acute stress. The current study aimed to investigate whether psychological suzhi can buffer state anxiety and heart rate responses to acute stress in adolescents. Healthy male adolescents (N = 63) were classified into high (N = 30) or low (N = 33) psychological suzhi groups based on the Chinese norm of adolescent psychological suzhi scale-simplified version. They completed both the modified Trier Social Stress Test for Groups and a specific control condition, with heart rate and state anxiety assessed. Data were analysed with mixed-design repeated measures analysis of variance. The results showed that the modified Trier Social Stress Test for Groups condition effectively induced an increase in state anxiety and heart rate. Furthermore, individuals with higher levels of psychological suzhi showed lower state anxiety and heart rate stress responses. The present study indicated that psychological suzhi is an important internal resource against acute stress, which may inform interventions for male adolescents exposed to acute stress. K E Y W O R D S acute stress, heart rate, male adolescents, psychological suzhi, state anxiety 1 | INTRODUCTION Psychological suzhi is a mature indigenous Chinese concept proposed by Chinese scholars within the context of quality-oriented education. It describes a comprehensive and integrated set of psychological qualities that facilitate Chinese children and adolescents' positive adaptation to the Chinese school environment (Wu et al., 2018). Zhang et al. (2011) defined psychological suzhi as a mental quality that is stable, essential, and implicit, and affects individuals' adaptive, developmental, and creative behaviours. Based on theoretical considerations and empirical studies on Chinese students over the past 30 years, psychological suzhi includes three interrelated dimensions: cognitive quality, individuality, and adaptability, all of which can be further divided into 14 elements, such as curiosity, self-monitoring, independence, perseverance, and stress adaptation (Zhang et al., 2017). As a kind of positive psychological quality, psychological suzhi has been increasingly indicated to be one of the key factors in children's and adolescents' development, including academic achievement, physical and mental health, and behavioural outcomes Wu et al., 2018). Moreover, recent evidence has suggested that psychological suzhi can buffer against chronic stress in daily life. For example, Wang (2015) found that psychological suzhi, as a moderator, attenuated the adverse effects of stress life events on depression and life satisfaction. Wu et al. (2018) also found that psychological suzhi buffered against the detrimental effects of bullying on social anxiety.