Objective To explore the dynamic changes in rehabilitation training experiences and influencing factors among children with developmental dysplasia of the hip (DDH) and their primary caregivers, and to provide a reference for optimizing rehabilitation training programs. Methods A longitudinal qualitative study was conducted.Fifteen DDH children undergoing open reduction surgery, along with their primary caregivers, were selected using purposive sampling.Semi-structured interviews were conducted at 1-2 days before surgery, 6-8 weeks, 3 months, and 6 months after surgery.A longitudinal qualitative research approach was used to conduct cross-sectional and longitudinal analyses of the data. Results Two themes and eight subthemes were extracted:the changing trajectory of rehabilitation training experiences among DDH children and their caregivers (before surgery:lack of know-ledge about the disease and rehabilitation; 6-8 weeks after surgery:postoperative pain and activity limitations under brace constraints; 3 months after surgery:physical readaptation during joint functional recovery; 6 months after surgery:fear of weight-bearing ambulation and concerns regarding gait correction), the influencing factors of participating rehabilitation training among DDH children and their caregivers (before surgery: differences in family willingness and ability to participate; 6-8 weeks after surgery:the physical and psychological burden of prolonged bed rest; 3 months after surgery:positive feedback after training promoting the continuation of rehabilitation behaviors; 6 months after surgery:difficulties in maintaining long-term rehabilitation behaviors and the supportive role of collaboration between medical staff and patients). Conclusion The experiences of rehabilitation training exhibit dynamic changes at different stages in DDH children and their caregivers, indicating the need for adequate rehabilitation support from society.Medical staff should pay attention to the experiences and needs of DDH children and their primary ca-regivers during rehabilitation training, adjust intervention methods promptly, and promote functional recovery.