目的 基于价值共创理论，采用多层次服务设计流程与方法，设计可满足青年群体数字心理健康干预诉求的数字疗法服务系统。方法 先通过文献回顾，论述数字疗法的概念与发展现状，解释价值共创和多层次服务设计的理论框架与应用方式。再参照多层次服务设计的五阶段流程完成数字疗法服务系统设计。在设计过程中，以价值共创为理论指导，分别从服务概念、服务系统和服务接触三个层级优化数字疗法服务方案的价值创造模式、价值传递路径和资源利用效率。结果 经设计实践与可用性测试，本文产出了一个具有高可用性、用户满意度与用户体验水平的数字疗法服务方案，从中总结四点可用于指导数字疗法服务系统设计的设计策略。结论 数字疗法作为新兴的数字心理健康干预方式，能够为患者带来全新的数字医疗服务体验。尤其是为患者提供符合其价值诉求和具有良好用户体验的数字疗法服务方案，更有助于增强患者的治疗参与度和依从性。

The work aims to use a multilevel service design process and methodology to create a digital therapeutics (DTx) service system that can satisfy youth groups' needs for digital mental health interventions, based on the principle of value co-creation. By going over the history of DTx through a literature review, theoretical underpinnings and practical applications of value co-creation and multilevel service design were explained. The five-stage multilevel service design process was then used to finish the design of the DTx service system. Value co-creation served as a theoretical roadmap for optimizing the DTx service solutions' value creation mode, value delivery method, and resource utilization efficiency at three different levels:service concept, service system, and service encounter. This article presented four design strategies that could be used to drive the design of DTx service systems and generate a DTx service solution with high usability, user satisfaction, and user experience levels after design practice and usability testing. DTx is an emerging digital mental health intervention that can offer patients with a new digital healthcare service experience. In particular, offering patients with a DTx service solution that satisfies their value demands and has a positive user experience can help to improve patients' therapeutic engagement and compliance.