中文摘要：

“混合社会组织”作为一种新兴的组织形式创新地用商业化手段解决社会问题，逐渐在世界范围内兴起。然而，现有研究对于这种新的组织形式如何生存并获取合法性还缺少充分的关注。通过壹基金获取合法性的过程，我们首先刻画了规制、规范和认知三种合法性如何随着时间相互作用的动态机制。其次，我们归纳了制度行动者在不同的制度环境下而采取的各种合法化策略。本文报告了一个从下至上的民间组织、商业企业和政府共同参与的社会创新案例，为中国民间组织转型和创新提供了重要的实践启示。

英文摘要：

The existence of hybrid organizations that incorporate elements from multiple institutional logics poses an effi-cient and sustainable way to solve social problems. However, we know relatively little about how this new type of organi-zational form secures legitimacy at the first place. We aim to fill this gap by providing an in-depth case study of a hybrid social organization-“One Foundation”. Based on the process of legitimating One Foundation, we first provide a dynamic framework of the interaction process among three kinds of legitimacy including regulative legitimacy, normative legitima-cy and cognitive legitimacy. Then we summarize different types of institutional work that actors adopt to strategically take advantage of external institutional environment and acquire legitimacy. Our paper makes some important theoretical and practical contributions by providing a bottom-up social innovation case in the Chinese context.