As an emerging digital behavioral intervention approach, just-in-time adaptive intervention (JITAI) is grounded in real-time state monitoring to identify critical moments for behavior change, thereby delivering personalized and dynamically tailored intervention support.This approach has been applied in weight management for obese/overweight populations.This paper provides an overview of JITAI, its application design, effectiveness, practical challenges, and breakthrough strategies in weight management, with the aim of offering a reference for optimizing digital intervention protocols for weight management and promoting its translation into clinical practice.