The purpose of this study was to examine the counselling process and therapeutic efficacy of a strength-based career counseling model for dual-career women in Taiwan. Participants were 14 married dual-career women between 28 to 47 years of age (M = 36.64, SD = 5.40). Pariticipants were interviewed one week after termination of counseling, which ranged from 6 to 8 sessions. Data were collected through semi-structured interviews and analysed using grounded theory approach. Results indicated four counseling process themes: Personal readiness for counseling, counseling intervention, impact of external circumstances, and content of therapeutic efficacy. Moreover, the content of therapeutic efficacy could be inducted into three systems—internal system, including cognitive, emotional and behavioral dimensions; external and contextual system, including self/other relation and career dimensions, and a coordination system, including coping strategies and self-efficacy dimensions. According to the result, a model of change mechanism for the counseling process and the therapeutic efficacy content was proposed. Discussion and implications of results were provided and recommended.