Aims: This study aims at identifying the health effects of a strength‐based intervention on family caregivers of persons with dementia and to explore the underlying mechanism. The perception of family caregivers on the strength‐based intervention will also be explored. Design: This sequential mixed‐method study comprises a double‐blind randomized controlled trial and a descriptive qualitative study. Methods: A group of 372 family caregivers of persons with dementia will be recruited from community settings.