：在公众科学项目启动的初期阶段，如何在短时间内吸引志愿者的参与以解决公众参与动力不足问题是学界和业界共同关注的热点。文章聚焦于项目冷启动阶段，对公众参与数字人文类公众科学项目的动因展开实证研究。文章首先借鉴前人的研究成果，从平台、任务、志愿者3个维度提炼出相关的动机因素，并基于S-O-R理论构建了数字人文类公众科学项目冷启动阶段公众参与动因的实证模型。随后，通过调研方法收集了相关数据，并采用偏最小二乘法工具SmartPLS 3.0进行了假设检验。结果表明，平台层面和任务层面的因素会对志愿者的认知和情感层面的因素产生影响，志愿者的感知有用性、自我效能、娱乐享受、使命感对志愿者参与意愿产生积极影响。最后从组织机构角度、平台设计角度和任务设计角度为公众科学项目的实践发展提出若干建议。

Citizen science projects are growing in popularity amongst academia and industry as a means to collect data and solve scientific problems. In the initial stage of citizen science projects, how to motivate participants is a great challenge. Therefore, our study focuses on the cold start phase of citizen science projects in digital humanities domain and conducts an empirical study on the motivation of volunteers' participation in those projects. First, this study proposed main influence factors of volunteers' participation in citizen science projects from three dimensions: platforms, tasks, and volunteers. Then based on S-O-R theory, an empirical model of volunteers' motivations in the cold start stage was established. After that, the authors collected data through questionnaires and tested the hypotheses by SmartPLS 3.0. Results show that factors at the platform dimension and task dimension have an impact on volunteers' cognition and emotion levels, and volunteers' perceived usefulness, self-efficacy, enjoyment and commitment have a positive impact on volunteers' participation intention. Finally, some suggestions are put forward for the practical development of citizen science projects from the perspectives of organization structure, platform design and task design.