Abstract: Objective: To explore the experience in breast cancer patients before and after informing their parents of cancer diagnosis. Methods: The qualitative research was adopted. In-depth interviews were conducted with 19 breast cancer survivors. Data were analyzed by content analysis method. Results: Most interviewees had gone through the process of not informing their parents to inform them. The psychological experience before breast cancer patients informing their parents of cancer diagnosis includes worried about increasing the psychological burden of parents, worried about affecting parental health, thinking parents can't help them, feeling aggrieved and heart tired. There are positive and negative psychological experience after breast cancer patients informing parents. Positive psychological experience including parents are stronger than we expected, intimacy increased and psychological burden reduced. Negative psychological experience includes feeling guilty about parents and a sense of restraint. Conclusion: The psychological experience before breast cancer patients informing their parents of cancer diagnosisis more negative. The psychological experience after breast cancer patients informing their parents is complex, mainly positive psychological experience. Nurses should understand the psychological experience in breast cancer patients and help them to establish a good family support system.