In this project, considering that is the main center for treatment and counseling of cancer patients, the inpatient wards of men and women and the oncology clinic of this hospital were considered as the research environment. Researchers use various methods and tools to collect basic information for qualitative research, one of the most important of which is a questionnaire. Questionnaires include a series of closed or open-ended questions. By analyzing participants' responses, the researcher can obtain information about how people think, act, and plan about an idea or opinion. In this regard, according to the purpose of the study, which was to describe the couple's perception of family functioning when one of the couples had cancer, a family performance questionnaire was used.