This paper develops a model in which psychological capital mediates the relationship between transformational leadership behavior and followers' task performance and organizational commitment. Based on a sample of 230 MBA students in China and by using structural equation modeling, this paper examines the specific relations among different dimensions of transformational leadership, followers' task performance, organizational commitment and psychological capital. This results show that three dimensions of psychological capital, self-efficacy, hope and resilience mediate the relationship between transformational leadership and task performance; and that self-efficacy and resilience mediate the relationship between transformational leadership and organizational commitment. Implications for the theory and practice of leadership are discussed, and future research directions are offered.%探讨变革型领导影响下属的深层心理作用机制,即变革型领导是否会通过下属心理资本的中介作用对下属工作绩效和组织承诺产生影响.以230位MBA学员为样本,采用结构方程模型的方法分析了变革型领导行为、下属工作绩效、组织承诺以及下属心理资本各维度间的关系.研究结果表明,下属心理资本中的自我效能、希望和恢复力对变革型领导行为与下属工作绩效的关系起到中介作用；下属心理资本中的自我效能和恢复力对变革型领导行为与下属组织承诺的关系起到中介作用.
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