Objective To develop an internet-based supportive intervention program for family caregivers of older patients with lung cancer and to evaluate its clinical feasibility.Methods Using the Communal Coping Model as theoretical framework, an internet-based supportive intervention program was developed by literature review and expert consultation.Then, a feasibility study was conducted.Results The intervention program included 5 first-level indexes (disease-related information support, caregiving skills support, social and work support, psychological and emotional support, and communication support), 20 second-level indexes and 57 third-level indexes.Among 21 couples who met the inclusion criteria, only 15 of the couples participated in the study, with the recruitment rate of 71.4%.Twelve couples completed the study, with the retention rate of 80.0%.The overall adherence rate was （90.4±10.6）%, and the scoring rate of acceptance of the intervention was 96.1%.After 42 days of intervention, the score of supportive care needs of patients and the score of comprehensive needs of caregivers were significantly decreased （both P＜0.05）.The scores of dyadic coping of patients and caregivers were significantly improved after the intervention （both P＜0.05）.Conclusion The internet-based supportive intervention program for family caregivers of older patients with lung cancer is feasible, but the effectiveness needs to be verified by large sample size, randomized, controlled trials.